Document and Entity Information (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Jun. 02, 2014	Sep. 30, 2013
Document Document And Entity Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Mar. 31, 2014
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	FY
Entity Registrant Name	AMERICAN SUPERCONDUCTOR CORP /DE/
Entity Central Index Key	0000880807
Current Fiscal Year End Date	--03-31
Entity Filer Category	Accelerated Filer
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Common Stock, Shares Outstanding		79,419,295
Entity Public Float			$ 116.4

Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
ASSETS
Cash and cash equivalents	$ 43,114	$ 39,243
Accounts receivable, net	7,556	18,864
Inventory	20,694	33,473
Prepaid expenses and other current assets	9,004	22,469
Restricted cash	2,913	6,136
Total current assets	83,281	120,185
Property, plant and equipment, net	64,574	74,626
Intangibles, net	1,995	2,749
Restricted cash	3,394	4,820
Deferred tax assets	7,724	5,354
Other assets	7,541	9,020
Total assets	168,509	216,754
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	21,764	31,578
Note payable, current portion, net of discount of $555 as of March 31, 2014 and $458 as of March 31, 2013	6,240	4,158
Convertible note, current portion, net of discount of $4,289 as of March 31, 2013		4,610
Derivative liabilities	2,601	4,162
Deferred revenue	9,456	29,805
Deferred tax liabilities	7,761	5,444
Total current liabilities	47,822	79,757
Note payable, net of discount of $287 as of March 31, 2014 and $95 as of March 31, 2013	6,380	3,367
Convertible note, net of discount of $600 as of March 31, 2013		5,881
Deferred revenue	990	1,340
Other liabilities	1,058	1,291
Total liabilities	56,250	91,636
Commitments and contingencies (Note 13)
Stockholders' equity:
Common stock, $0.01 par value, 150,000,000 shares authorized; 78,929,903 and 60,300,466 shares issued and outstanding at March 31, 2014 and 2013, respectively	789	603
Additional paid-in capital	966,390	923,847
Treasury stock, at cost, 57,046 shares at March 31, 2014	(370)	(313)
Accumulated other comprehensive income	1,839	1,112
Accumulated deficit	(856,389)	(800,131)
Total stockholders' equity	112,259	125,118
Total liabilities and stockholders' equity	$ 168,509	$ 216,754

Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Note payable, current portion, net of discount	$ 555	$ 458
Current portion of convertible note, net of discount		4,289
Note payable, net of current portion and discount	287	95
Convertible note net of current portion and discount		$ 600
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	78,929,903	60,300,466
Common stock, shares outstanding	78,929,903	60,300,466
Treasury Stock, shares	57,046

Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Revenues	$ 84,117	$ 87,419	$ 76,543
Cost and operating expenses:
Cost of revenues	72,858	71,937	82,882
Research and development	12,173	15,325	27,271
Selling, general and administrative	37,230	49,652	72,118
Restructuring and impairments	2,998	7,922	9,188
Write-off of advance payment			20,551
Amortization of acquisition related intangibles	287	324	972
Total operating expenses	125,546	145,160	212,982
Operating loss	(41,429)	(57,741)	(136,439)
Change in fair value of derivatives and warrants	1,872	7,556
Loss on extinguishment of debt	(5,197)
Interest (expense) income, net	(9,661)	(14,948)	243
Other (expense) income, net	(991)	(1,262)	738
Loss before income tax (benefit) expense	(55,406)	(66,395)	(135,458)
Income tax (benefit) expense	852	(264)	1,369
Net loss	$ (56,258)	$ (66,131)	$ (136,827)
Net loss per common share
Basic	$ (0.90)	$ (1.25)	$ (2.69)
Diluted	$ (0.90)	$ (1.25)	$ (2.69)
Weighted average number of common shares outstanding
Basic	62,622	53,070	50,842
Diluted	62,622	53,070	50,842

Consolidated Statements of Comprehensive (Loss) Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Net loss	$ (56,258)	$ (66,131)	$ (136,827)
Other comprehensive (loss) income, net of tax:
Foreign currency translation (losses) gains	727	(887)	(1,790)
Unrealized losses on investments		(28)
Total other comprehensive (loss) income, net of tax	727	(915)	(1,790)
Comprehensive loss	$ (55,531)	$ (67,046)	$ (138,617)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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+ Details

Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Balance at Mar. 31, 2011	$ 292,855	$ 507	$ 885,704		$ 3,817	$ (597,173)
Balance, shares at Mar. 31, 2011		50,719,000
Exercise of stock options	24		24
Exercise of stock options, shares		3,000
Issuance of common stock - ESPP	304	1	303
Issuance of common stock - ESPP, shares		89,000
Issuance of common stock - restricted shares		7	(7)
Issuance of common stock - restricted shares, shares		698,000
Stock-based compensation expense	9,864		9,864
Issuance of stock for calendar 401(k) match	720	1	719
Issuance of stock for calendar 401(k) match, shares		127,000
Contingent consideration		4	(4)
Contingent consideration shares		350,000
Treasury stock, at cost	(271)			(271)
Cumulative translation adjustment	(1,790)				(1,790)
Net loss	(136,827)					(136,827)
Balance at Mar. 31, 2012	164,879	520	896,603	(271)	2,027	(734,000)
Balance, shares at Mar. 31, 2012		51,986,000
Exercise of stock options	2		2
Issuance of common stock - ESPP	290	1	289
Issuance of common stock - ESPP, shares		100,000
Issuance of common stock - restricted shares	1,619	25	1,594
Issuance of common stock - restricted shares, shares		2,463,000
Stock-based compensation expense	8,138		8,138
Issuance of stock for calendar 401(k) match	539	2	537
Issuance of stock for calendar 401(k) match, shares		158,000
Issuance of common stock to settle liabilities	16,739	55	16,684
Issuance of common stock to settle liabilities, shares		5,593,000
Treasury stock, at cost	(42)			(42)
Cumulative translation adjustment	(887)				(887)
Net loss	(66,131)					(66,131)
Unrealized losses on investments	(28)				(28)
Balance at Mar. 31, 2013	125,118	603	923,847	(313)	1,112	(800,131)
Balance, shares at Mar. 31, 2013	60,300,466	60,300,000
Exercise of stock options, shares
Issuance of common stock - ESPP	168	1	167
Issuance of common stock - ESPP, shares		100,000
Issuance of common stock - restricted shares	502	18	484
Issuance of common stock - restricted shares, shares		1,780,000
Stock-based compensation expense	10,696		10,696
Issuance of stock for calendar 401(k) match	425	2	423
Issuance of stock for calendar 401(k) match, shares		208,000
Issuance of common stock to settle liabilities	23,480	116	23,364
Issuance of common stock to settle liabilities, shares		11,669,000
Treasury stock, at cost	(57)			(57)
Cumulative translation adjustment	727				727
Net loss	(56,258)					(56,258)
Issuance of common stock-ATM, net of costs	7,458	49	7,409
Issuance of common stock-ATM, net of costs, shares		4,873,000
Balance at Mar. 31, 2014	$ 112,259	$ 789	$ 966,390	$ (370)	$ 1,839	$ (856,389)
Balance, shares at Mar. 31, 2014	78,929,903	78,930,000

Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net loss	$ (56,258)	$ (66,131)	$ (136,827)
Adjustments to reconcile net loss to net cash used in operations:
Depreciation and amortization	10,615	13,054	15,455
Stock-based compensation expense	10,696	8,138	9,864
Write-off of advanced payment to The Switch			20,551
Patent costs			4,917
Restructuring charges, net of payments	167	902	2,798
Impairment of long-lived and intangible assets	1,265	4,984	1,715
Provision for excess and obsolete inventory	316	2,230	4,357
Adverse purchase commitment losses (recoveries), net		(7,768)	(1,299)
Prepaid VAT reserve	1,426
Loss on minority interest investments	1,008	2,231	2,407
Change in fair value of derivatives and warrants	(1,872)	(7,556)
Loss on extinguishment of debt	5,197
Non-cash interest expense	7,713	12,426
Other non-cash items	1,813	2,427	771
Changes in operating asset and liability accounts:
Accounts receivable	11,379	(751)	(4,820)
Inventory	13,043	(6,457)	(7,528)
Prepaid expenses and other current assets	12,512	8,887	1,685
Accounts payable and accrued expenses	(10,861)	(21,864)	(64,148)
Deferred revenue	(21,426)	9,977	9,060
Net cash used in operating activities	(13,267)	(45,271)	(141,042)
Cash flows from investing activities:
Purchase of property, plant and equipment	(278)	(1,430)	(10,895)
Proceeds from the sale of property, plant and equipment	54	136
Proceeds from the maturity of marketable securities		5,276	110,117
Change in restricted cash	4,669	3,678	(9,093)
Purchase of intangible assets			(4,227)
Purchase of minority investments			(1,800)
Advanced payment for planned acquisition			(20,551)
Change in other assets	(436)	(307)	(214)
Net cash provided by investing activities	4,009	7,353	63,337
Cash flows from financing activities:
Employee taxes paid related to net settlement of equity awards	(57)	(42)	(271)
Proceeds from the issuance of debt, net of expenses	9,842	32,895	4,682
Repayment of debt	(4,615)	(1,923)	(4,682)
Proceeds from public equity offering, net	7,458
Proceeds from exercise of employee stock options and ESPP	168	291	328
Net cash provided by financing activities	12,796	31,221	57
Effect of exchange rate changes on cash and cash equivalents	333	(339)	144
Net increase (decrease) in cash and cash equivalents	3,871	(7,036)	(77,504)
Cash and cash equivalents at beginning of year	39,243	46,279	123,783
Cash and cash equivalents at end of year	43,114	39,243	46,279
Supplemental schedule of cash flow information:
Cash paid for income taxes, net of refunds	864	(311)	13,357
Issuance of common stock to settle liabilities	24,407	18,896	720
Cash paid for interest	$ 990	$ 787

Nature of the Business and Operations and Liquidity

12 Months Ended

Mar. 31, 2014

Nature of the Business and Operations and Liquidity

1. Nature of the Business and Operations and Liquidity

Nature of the Business and Operations

American Superconductor Corporation (“AMSC” or the “Company”) was founded on April 9, 1987. The Company is a leading provider of megawatt-scale solutions that lower the cost of wind power and enhance the performance of the power grid. In the wind power market, the Company enables manufacturers to field wind turbines through its advanced engineering, support services and power electronics products. In the power grid market, the Company enables electric utilities and renewable energy project developers to connect, transmit and distribute power through its transmission planning services and power electronics and superconductor-based products. The Company’s wind and power grid products and services provide exceptional reliability, security, efficiency and affordability to its customers.

The Company’s consolidated financial statements for the year ended March 31, 2014, were prepared on a going concern basis in accordance with United States generally accepted accounting principles (“GAAP”). The going concern basis of presentation assumes that the Company will continue operations and will be able to realize its assets and discharge its liabilities and commitments in the normal course of business.

Liquidity

The Company has experienced recurring operating losses and as of March 31, 2014 and 2013, the Company had an accumulated deficit of $856.4 million and $800.1 million, respectively. In addition, the Company has experienced recurring negative operating cash flows. At March 31, 2014, the Company had cash and cash equivalents of $43.1 million which compares to cash used in operations of $13.3 million for the year ended March 31, 2014. At March 31, 2013, the Company had cash and cash equivalents of $39.2 million which compares to cash used in operations of $45.3 million for the year ended March 31, 2013.

From April 1, 2011 through the date of this filing, the Company reduced its global workforce by approximately 68%. The Company is currently in the process of consolidating certain business operations to reduce facility costs. As of March 31, 2014, the Company had a global workforce of approximately 269 persons. The Company plans to closely monitor its expenses and if required, expects to further reduce operating costs and capital spending to enhance liquidity.

On April 4, 2012, the Company completed a private placement of $25.0 million aggregate principal amount of a 7% senior unsecured convertible note (the “Initial Note”) with Capital Ventures International (“CVI”). On December 20, 2012, the Company agreed to exchange the Initial Note for a new unsecured, senior convertible note (the “Exchanged Note”), which had the same principal amount and accrued interest as the Initial Note at the time of the exchange. On March 2, 2014, the Company entered into an Exchange Agreement with CVI, pursuant to which the Company exchanged the Exchanged Note for approximately 6.6 million shares of common stock and extinguished the debt. (See Note 9, “Debt”, for further information regarding these debt arrangements, including the covenants, restrictions and events of default under the agreements.)

On June 5, 2012, the Company entered into a Loan and Security Agreement (the “Term Loan”), under which the Company borrowed $10.0 million. The Term Loan contains certain covenants and restrictions including, among others, a requirement to maintain a minimum unrestricted cash balance in the U.S. equal to the remaining principal balance. On November 15, 2013, the Company entered into an amendment of the Term Loan (the “New Term Loan”, and collectively with the Term Loan, the “Term Loans”) under which the Company borrowed an additional $10.0 million. The Term Loans contain certain covenants and restrictions. (See Note 9, “Debt”, for further information regarding these debt arrangements, including the covenants, restrictions and events of default under the agreements.) The Company believes that it is in compliance with the covenants and restrictions included in the agreements governing these debt arrangements as of the date of this Annual Report on Form 10-K.

On November 15, 2013, the Company entered into an At-Market Sales Arrangement (“ATM”) under which the Company may, at its discretion, sell up to $30.0 million of shares of its common stock (before expenses) through its sales agent, MLV & Co. LLC. During the year ended March 31, 2014, the Company received net proceeds of $7.5 million, including sales and commissions and offering expenses, from sales of approximately 4.9 million shares of its common stock at an average sales price of approximately $1.62 per share. During the three months ended March 31, 2014, the Company received net proceeds of $4.1 million from sales of approximately 2.5 million shares of its common stock at an average sales price of approximately $1.74 per share under the ATM. (See Note 12, “Stockholders’ Equity”, for further information regarding the ATM.) As of March 31, 2014, there was approximately $22.1 million of availability under the Company’s ATM (see further discussion below).

Sales of common stock under the ATM may be made from time to time, at the Company’s discretion, in order to enhance liquidity. In addition, the Company is actively seeking to sell its minority investments in Tres Amigas and Blade Dynamics and has engaged a financial advisor to assist with that effort. (See Note 15, “Minority Investments”, for further information about such investments.) There can be no assurance that the Company will be able to sell one or both of these investments on commercially reasonable terms or at all.

The Company believes it has sufficient available liquidity to fund its operations, capital expenditures and scheduled cash payments under its debt obligations through June 30, 2015. The Company’s liquidity is highly dependent on its ability to increase revenues, control its operating costs, its ability to utilize the ATM to raise additional capital as required, at its discretion, and its ability to maintain compliance with the covenants and restrictions on its debt obligations (or obtain waivers from its lender in the event of non-compliance). There can be no assurance that the Company will be able to continue to utilize the ATM.

Summary of Significant Accounting Policies

12 Months Ended

Mar. 31, 2014

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

Basis of Consolidation

The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany balances and transactions are eliminated. Certain reclassifications of prior years’ amounts have been made to conform to the current year presentation. These reclassifications had no effect on net income, cash flows from operating activities or stockholders’ equity.

Use of Estimates

The preparation of financial statements in conformity with generally accepted accounting principles of the United States of America, (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. The Company bases its estimates on historical experience and various other factors believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. On an ongoing basis, the Company evaluates its estimates, including those related to revenue recognition, collectability of receivables, realizability of inventory, goodwill and intangible assets, warranty provisions, stock-based compensation, valuation of warrant and derivative liabilities, tax reserves, and deferred tax assets. Provisions for depreciation are based on their estimated useful lives using the straight-line method. Some of these estimates can be subjective and complex and, consequently, actual results may differ from these estimates under different assumptions or conditions. While for any given estimate or assumption made by the Company’s management there may be other estimates or assumptions that are reasonable, the Company believes that, given the current facts and circumstances, it is unlikely that applying any such other reasonable estimate or assumption would materially impact the financial statements.

Cash Equivalents

Cash equivalents consist of highly liquid instruments with maturities of three months or less that are regarded as high quality, low risk investments and are measured using such inputs as quoted prices, and are classified within Level 1 of the valuation hierarchy. Cash equivalents consist principally of certificates of deposits and money market accounts.

Accounts Receivable

Accounts receivable consist of amounts owed by commercial companies and government agencies. Accounts receivable are stated net of allowances for doubtful accounts. The Company’s accounts receivable relate principally to a limited number of customers. As of March 31, 2014, three customers, Inox Wind Limited (“Inox”), CG Power Solutions UK Ltd. (“CGPS”), and Beijing JINGCHENG New Energy Co., Ltd. (“JCNE”), accounted for approximately 20%, 14% and 13%, respectively, of its total receivable balance. As of March 31, 2013, three customers, Inox, CGPS, and Hyundai Heavy Industries Co. Ltd. (“HHI”), accounted for approximately 41%, 17% and 11%, respectively, of its total receivable balance. Changes in the financial condition or operations of its customers may result in delayed payments or non-payments which would adversely impact its cash flows from operating activities and/or its results of operations. As such the Company may require collateral, advanced payment or other security based upon the customer history and/or creditworthiness. In determining the allowance for doubtful accounts, the Company evaluates the collectability of accounts receivable based primarily on the probability of recoverability based on historical collection and write-off experience, the age of past due receivables, specific customer circumstances, and current economic trends. If the financial condition of the Company’s customers were to deteriorate, resulting in an impairment of their ability to make payment, additional allowances may be required. Failure to accurately estimate the losses for doubtful accounts and ensure that payments are received on a timely basis could have a material adverse effect on the Company’s business, financial condition, results of operations, and cash flows.

Inventory

Inventories include material, direct labor and related manufacturing overhead, and are stated at the lower of cost or market determined on a first-in, first-out basis. The Company records inventory when it takes delivery and title to the product according to the terms of each supply contract.

Program costs may be deferred and recorded as inventory on contracts on which costs are incurred in excess of approved contractual amounts and/or funding, if future recovery of the costs is deemed probable.

At each balance sheet date, the Company evaluates its ending inventories for excess quantities and obsolescence. Inventories that management considers excess or obsolete are reserved. Management considers forecasted demand in relation to the inventory on hand, competitiveness of product offerings, market conditions and product life cycles when determining excess and obsolescence and net realizable value adjustments. Once inventory is written down and a new cost basis is established, it is not written back up if demand increases.

For the year ended March 31, 2014, the Company recorded an inventory reserve of approximately $0.3 million based on evaluating its ending inventory on hand for excess quantities and obsolescence. The Company recorded an inventory reserve of approximately $2.2 million during the year ended March 31, 2013, based on its evaluation of forecasted demand in relation to the inventory on hand and market conditions surrounding its products as a result of the assumption that Sinovel and certain other customers in China will fail to meet their contractual obligations and demand that was previously forecasted will fail to materialize. The Company first recorded a benefit to cost of revenues related to the sale or usage of inventories reserved in a prior period during the year ended March 31, 2012. For the years ended March 31, 2014, 2013, and 2012, the Company recorded benefits of $4.3 million, $2.1 million, and $0.8 million respectively.

Property, Plant and Equipment

Property, plant and equipment are carried at cost less accumulated depreciation and amortization. The Company accounts for depreciation and amortization using the straight-line method to allocate the cost of property, plant and equipment over their estimated useful lives as follows:

Asset Classification		Estimated Useful Life in Years
Building		40
Process upgrades to the building		10-40
Machinery and equipment		3-10
Furniture and fixtures		3-5
Leasehold improvements		Shorter of the estimated useful life or the remaining lease term

Expenditures for maintenance and repairs are expensed as incurred. Upon retirement or other disposition of assets, the costs and related accumulated depreciation are eliminated from the accounts and the resulting gain or loss is reflected in operating expenses.

Valuation of Long-Lived Assets

The Company periodically evaluates its long-lived assets, consisting principally of fixed assets and amortizable intangible assets for potential impairment. In accordance with the applicable accounting guidance for the treatment of long-lived assets, the Company reviews the carrying value of its long-lived assets or asset group that is held and used, including intangible assets subject to amortization, for impairment whenever events and circumstances indicate that the carrying value of the assets may not be recoverable. Under the held and used approach, the asset or asset group to be tested for impairment should represent the lowest level for which identifiable cash flows are largely independent of the cash flows of other groups of assets and liabilities. The Company evaluates its long-lived assets whenever events or circumstances suggest that the carrying amount of an asset or group of assets may not be recoverable from the estimated undiscounted future cash flows.

In fiscal 2013, 2012 and 2011, in response to challenging liquidity and market conditions, the Company entered into and completed certain restructuring activities, approved by the Board of Directors, in order to reduce costs and align its strategic priorities. Since the restructuring action impacted all of its operations, management concluded that there were indicators of potential impairment of its long-lived assets in each of those fiscal years and the Company therefore conducted assessments of the recoverability of these assets by comparing its carrying value of the assets to the pre-tax undiscounted cash flows estimated to be generated by those assets over their remaining book useful lives. Based on the calculations performed by management, the sum of the undiscounted cash flows forecasted to be generated by certain assets were less than the carrying value of those assets. Therefore, there were indications that certain of its assets were impaired and, as a result, the Company performed additional analysis. An evaluation of the level of impairment was made by comparing the implied fair value of those definite long-lived tangible and intangible assets of each reporting unit against their carrying values.

The fair values of the impacted property and equipment were based on what the Company could reasonably expect to sell each asset from the perspective of a market participant. The determination of the fair value of its property and equipment includes estimates and judgments regarding the marketability and ultimate sales price of individual assets. The Company utilized market data and approximations from comparable analyses to arrive at the estimated fair values of the impacted property and equipment. The fair values of amortization intangible assets related to completed technology and trade names were determined using primarily the relief-from-royalty method over the estimated economic lives of those assets from the perspective of a market participant. During fiscal 2013, the Company determined that the fair values of those assets were greater than or equal to their carrying values and no impairment charge was recorded. During fiscal 2012 and 2011, management determined that certain of its corporate assets and Grid segment property, plant and equipment were impaired as their carrying values exceeded their fair values. The Company determined the long-lived assets of its Wind segment were not impaired. Accordingly, for the year ended March 31, 2013, the Company recorded an impairment charge on certain of its corporate assets and for the years ended March 31, 2013 and March 31, 2012, the Company recorded impairment charges on certain of its Grid segment property, plant and equipment. For the years ended March 31, 2013 and 2012, these charges totaled $5.0 million and $1.7 million, respectively.

Equity Method Investments

The Company uses the equity method of accounting for investments in entities in which it has an ownership interest, but does not exercise a controlling interest in the operating and financial policies of an investee. Under this method, an investment is carried at the acquisition cost, plus the Company’s equity in undistributed earnings or losses since acquisition.

The Company periodically tests its investments for potential impairment whenever events and circumstances indicate that the carrying value of its investments may not be recoverable. During the year ended March 31, 2014, the Company recorded an impairment charge of $1.3 million on its investment in Blade Dynamics Ltd. (See Note 15, “Minority Investments”, for further discussion.)

Revenue Recognition

The Company recognizes revenue for product sales upon customer acceptance, which can occur at the time of delivery, installation or post-installation, provided persuasive evidence of an arrangement exists, delivery has occurred, the sales price is fixed or determinable and the collectability is reasonably assured. Existing customers are subject to ongoing credit evaluations based on payment history and other factors. If it is determined during the arrangement that collectability is not reasonably assured, revenue is recognized on a cash basis of accounting. Certain of the Company’s contracts involve retention amounts which are contingent upon meeting certain performance requirements through the expiration of the contract warranty periods. For contractual arrangements that involve retention, the Company recognizes revenue for these amounts upon the expiration of the warranty period, meeting the performance requirements and when collection of the fee is reasonably assured.

During the year ended March 31, 2011, the Company determined that revenues from certain of its customers in China could not be recorded for shipments made according to the delivery terms, as the fee was not fixed or determinable or collectability was not reasonably assured. For these customers, the Company is utilizing a cash basis of accounting with cash applied first against accounts receivable balances, then costs of shipments (inventory and value added taxes) before recognizing any gross margin. Payments of $3.7 million, $3.4 million, and $5.2 million, were received from these customers during the years ended March 31, 2014, 2013, and 2012, respectively, for past shipments and recorded as revenue.

For certain arrangements, such as contracts to perform research and development, prototype development contracts and certain product sales, the Company records revenues using the percentage-of-completion method, measured by the relationship of costs incurred to total estimated contract costs. Percentage-of-completion revenue recognition accounting is predominantly used on long-term prototype development contracts with the U.S. government and certain commercial turnkey contracts. The Company follows this method since reasonably dependable estimates of the revenues and costs applicable to various stages of a contract can be made. However, the ability to reliably estimate total costs at completion is challenging, especially on long-term prototype development contracts, and could result in future changes in contract estimates. For contracts where reasonably dependable estimates of the revenues and costs cannot be made, the Company follows the completed-contract method.

The Company enters into sales arrangements that may provide for multiple deliverables to a customer. Sales of certain products may include extended warranty and support or service packages, and at times include performance bonds. As these contracts progress, the Company continually assesses the probability of a payout from the performance bond. Should the Company determine that such a payout is likely; the Company would record a liability. The Company would reduce revenue to the extent a liability is recorded. In addition, the Company enters into licensing arrangements that include training services.

Deliverables are separated into more than one unit of accounting when (1) the delivered element(s) have value to the customer on a stand-alone basis, and (2) delivery of the undelivered element(s) is probable and substantially in the control of the Company. In general, revenues are separated between the different product shipments which have stand-alone value, and the various services to be provided. Revenue for product shipments is recognized in accordance with the Company’s policy for product sales, while revenues for the services are recognized over the period of performance. The Company has determined that the licenses have no standalone value to the customer and are not separable from training services as the Company can only fully transfer the technology knowhow through the training component. Accordingly, the Company accounts for these arrangements as a single unit of accounting, and recognizes revenue over the period of the Company’s performance and milestones that have been achieved. Costs for these arrangements are expensed as incurred. The Company identifies all goods and/or services that are to be delivered separately under a sales arrangement and allocates revenue to each deliverable based on the element’s fair value as determined by vendor-specific objective evidence (“VSOE”), which is the price charged when that element is sold separately, or third-party evidence (“TPE”). When VSOE and TPE are unavailable, fair value is based on the Company’s best estimate of selling price utilizing a cost plus reasonable margin consistent with how the Company has set pricing historically for similar products and services. When the Company’s estimates are used to determine fair value, management makes its estimates using reasonable and objective evidence to determine the price. The Company reviews VSOE and TPE at least annually. If the Company concludes it is unable to establish fair values for one or more undelivered elements within a multiple-element arrangement using VSOE then the Company uses TPE or the best estimate of the selling price for that unit of accounting, being the price at which the vendor would transact if the unit of accounting were sold by the vendor regularly on a standalone basis.

The Company has elected to record taxes collected from customers on a net basis and does not include tax amounts in revenue or costs of revenue.

Customer deposits received in advance of revenue recognition are recorded as deferred revenue until customer acceptance is received. Deferred revenue also represents the amount billed to and/or collected from commercial and government customers on contracts which permit billings to occur in advance of contract performance/revenue recognition.

Product Warranty

Warranty obligations are incurred in connection with the sale of the Company’s products. The Company generally provides a one to three year warranty on its products, commencing upon installation. The costs incurred to provide for these warranty obligations are estimated and recorded as an accrued liability at the time of sale. Future warranty costs are estimated based on historical performance rates and related costs to repair given products. The accounting estimate related to product warranty involves judgment in determining future estimated warranty costs. Should actual performance rates or repair costs differ from estimates, revision to the estimated warranty liability would be required.

Research and Development Costs

Research and development costs are expensed as incurred.

Income Taxes

The Company’s provision for income taxes is composed of a current and a deferred portion. The current income tax provision is calculated as the estimated taxes payable or refundable on tax returns for the current year. The deferred income tax provision is calculated for the estimated future tax effects attributable to temporary differences and carry-forwards using expected tax rates in effect in the years during which the differences are expected to reverse.

Deferred income taxes are recognized for the tax consequences in future years of differences between the tax bases of assets and liabilities and their financial reporting amounts at each fiscal year end based on enacted tax laws and statutory tax rates applicable to the periods in which the differences are expected to affect taxable income. Valuation allowances are established when necessary to reduce net deferred tax assets to the amount expected to be realized. The Company has provided a valuation allowance against its U.S. and foreign deferred income tax assets since the Company believes that it is more likely than not that these deferred tax assets are not currently realizable due to uncertainty around profitability in the future.

Accounting for income taxes requires a two-step approach to recognizing and measuring uncertain tax positions. The first step is to evaluate the tax position for recognition by determining if, based on the technical merits, it is more likely than not that the position will be sustained upon audit, including resolution of related appeals or litigation processes, if any. The second step is to measure the tax benefit as the largest amount that is more than 50% likely of being realized upon ultimate settlement. The Company reevaluates these uncertain tax positions on a quarterly basis. This evaluation is based on factors including, but not limited to, changes in facts or circumstances, changes in tax law, effectively settled issues under audit and new audit activity. Any changes in these factors could result in the recognition of a tax benefit or an additional charge to the tax provision. The Company includes interest and penalties related to gross unrecognized tax benefits within the provision for income taxes.

The Company evaluates its permanent reinvestment assertions with respect to foreign earnings at each reporting period. The Company has not recorded a deferred tax asset for the temporary difference associated with the excess of the tax basis over its book basis in its Austrian subsidiary as the future tax benefit is not expected to reverse in the foreseeable future. The Company has recorded a deferred tax liability as of March 31, 2014 for the undistributed earnings of its remaining foreign subsidiaries for which it can no longer assert are permanently reinvested. The total amount of undistributed earnings available to be repatriated at March 31, 2014 was $1.5 million resulting in the recording of a $0.5 million net deferred federal and state income tax liability.

Stock-Based Compensation

The Company accounts for stock-based payment transactions using a fair value-based method and recognizes the related expense in the results of operations.

Stock-based compensation is estimated at the grant date based on the fair value of the award and is recognized as expense over the requisite service period of the award. The fair value of restricted stock awards is determined by reference to the fair market value of the Company’s common stock on the date of grant. The Company uses the Black-Scholes option pricing model to estimate the fair value of awards with service and performance conditions. For awards with service conditions only, the Company recognizes compensation cost on a straight-line basis over the requisite service/vesting period. For awards with performance conditions, accruals of compensation cost are made based on the probable outcome of the performance conditions. The cumulative effect of changes in the probability outcomes are recorded in the period in which the changes occur.

Determining the appropriate fair value model and related assumptions requires judgment, including estimating stock price volatilities of the Company’s common stock and expected terms. The expected volatility rates are estimated based on historical and implied volatilities of the Company’s common stock. The expected term represents the average time that the options that vest are expected to be outstanding based on the vesting provisions and the Company’s historical exercise, cancellation and expiration patterns.

The Company estimates pre-vesting forfeitures when recognizing compensation expense based on historical and forward-looking factors. Changes in estimated forfeiture rates and differences between estimated forfeiture rates and actual experience may result in significant, unanticipated increases or decreases in stock-based compensation expense from period to period. The termination of employment of certain employees who hold large numbers of stock-based awards may also have a significant, unanticipated impact on forfeiture experience and, therefore, on stock-based compensation expense. The Company will update these assumptions on at least an annual basis and on an interim basis if significant changes to the assumptions are warranted.

Computation of Net Loss per Common Share

Basic net loss per share (“EPS”) is computed by dividing net loss by the weighted-average number of common shares outstanding for the period. Diluted EPS is computed by dividing the net loss by the weighted-average number of common shares and dilutive common equivalent shares outstanding during the period, calculated using the treasury stock method. Common equivalent shares include the effect of restricted stock, exercise of stock options and warrants and contingently issuable shares. For the years ended March 31, 2014, 2013, and 2012, common equivalent shares of 6,431,584, 10,725,840, and 2,290,416, respectively, were not included in the calculation of diluted EPS as they were considered antidilutive. The following table reconciles the numerators and denominators of the EPS calculation for the years ended March 31, 2014, 2013, and 2012 (in thousands except per share amounts):

	Year ended March 31,
	2014			2013			2012

Numerator:
Net loss	$	(56,258	)	$	(66,131	)	$	(136,827	)
Denominator:
Weighted-average shares of common stock outstanding		64,111			53,537			51,144
Weighted-average shares subject to repurchase		(1,489	)		(467	)		(302	)
Shares used in per-share calculation ― basic		62,622			53,070			50,842
Shares used in per-share calculation ― diluted		62,622			53,070			50,842
Net loss per share ― basic	$	(0.90	)	$	(1.25	)	$	(2.69	)
Net loss per share ― diluted	$	(0.90	)	$	(1.25	)	$	(2.69	)

Foreign Currency Translation

The functional currency of all the Company’s foreign subsidiaries is the U.S. dollar, except for AMSC Austria, for which the local currency (Euro) is the functional currency, and AMSC China, for which the local currency (Renminbi) is the functional currency. The assets and liabilities of AMSC Austria and AMSC China are translated into U.S. dollars at the exchange rate in effect at the balance sheet date and income and expense items are translated at average rates for the period. Cumulative translation adjustments are excluded from net loss and shown as a separate component of stockholders’ equity. Net foreign currency transaction gains (losses) are included in net loss and were ($0.1) million, $1.0 million, and $3.1 million for the years ended March 31, 2014, 2013 and 2012, respectively. The Company has no restrictions on the foreign exchange activities of its foreign subsidiaries, including the payment of dividends and other distributions.

Risks and Uncertainties

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could materially differ from those estimates and would impact future results of operations and cash flows.

The Company invests its available cash with high-credit, quality financial instruments and invests primarily in investment-grade marketable securities, including, but not limited to, government obligations, money market funds and corporate debt instruments.

Several of the Company’s government contracts are being funded incrementally, and as such, are subject to the future authorization, appropriation, and availability of government funding. The Company has a history of successfully obtaining financing under incrementally-funded contracts with the U.S. government and it expects to continue to receive additional contract modifications in the year ending March 31, 2014 and beyond as incremental funding is authorized and appropriated by the government.

Contingencies

From time to time, the Company may be involved in legal and administrative proceedings and claims of various types. The Company records a liability in its consolidated financial statements for these matters when a loss is known or considered probable and the amount can be reasonably estimated. Management reviews these estimates in each accounting period as additional information is known and adjusts the loss provision when appropriate. If the loss is not probable or cannot be reasonably estimated, a liability is not recorded in the consolidated financial statements. If, with respect to a matter, it is not both probable to result in liability and the amount of loss cannot be reasonably estimated, an estimate of possible loss or range of loss is disclosed unless such an estimate cannot be made. The Company does not recognize gain contingencies until they are realized. Legal costs incurred in connection with loss contingencies are expensed as incurred. The Company recorded a loss contingency of $1.8 million for the year ended March 31, 2013. (See Note 13, “Commitments and Contingencies,” for further information regarding the Company’s pending litigation.)

Debt

For debt arrangements, the Company considers any embedded equity-linked components and accounts for the fair value of any embedded warrants and derivatives. The Company elects not to use the fair value option for recording debt arrangements and elects to record the debt at the stated value of the loan agreement on the date of issuance. Any other elements present are reviewed to determine if they are embedded derivatives requiring bifurcation and requiring valuation under the fair value option. Derivatives and warrants, which meet the condition to satisfy an obligation by issuing a variable number of equity shares, are recorded at fair value. The carrying value assigned to the host instrument will be the difference between the previous carrying value of the host instrument and the fair value of the warrants and derivatives. There is no immediate gain/loss from the initial recognition and measurement if the embedded derivative is accounted for separately from its host contract. There is an offsetting debt discount or premium as a result of the fair value assigned to the warrants and derivatives, as well as any debt issuance costs, which is amortized under the effective interest method over the term of the loan. Each reporting period, fair value is assessed for the warrants and derivatives with the change in value being recorded as other income/loss. (See Note 9, “Debt,” and Note 10, “Warrants and Derivative Liabilities,” for a full discussion regarding the activity and financial impact for the Company’s debt, warrants and derivative liabilities.)

Disclosure of Fair Value of Financial Instruments

The Company’s financial instruments consist principally of cash and cash equivalents, accounts receivable, accounts payable, accrued expenses, warrants to purchase shares of common stock, derivatives, a senior convertible note and senior secured term loan. The carrying amounts of these instruments approximate fair value at March 31, 2014 and 2013. The estimated fair values have been determined through information obtained from market sources and management estimates.

- Definition

The entire disclosure for all significant accounting policies of the reporting entity.

+ References+ Details

Fair Value Disclosures

12 Months Ended

Mar. 31, 2014

Fair Value Disclosures

3. Fair Value Disclosures

Fair Value Hierarchy

A valuation hierarchy for disclosure of the inputs to valuation used to measure fair value has been established. This hierarchy prioritizes the inputs into three broad levels as follows:

Level 1 -

Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.

Level 2 -

Inputs include quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability, and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs).

Level 3 -

Unobservable inputs that reflect the Company’s assumptions that market participants would use in pricing the asset or liability. The Company develops these inputs based on the best information available, including its own data.

The Company provides a gross presentation of activity within the Level 3 measurement roll-forward and details of transfers in and out of Level 1 and 2 measurements. A change in the hierarchy of an investment from its current level is reflected in the period during which the pricing methodology of such investment changes. Disclosure of the transfer of securities from Level 1 to Level 2 or Level 3 is made in the event that the related security is significant to total cash and investments. The Company did not have any transfers of assets and liabilities between Level 1 and Level 3 of the fair value measurement hierarchy during the years ended March 31, 2014 and 2013.

A financial asset’s or liability’s classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement.

The following table provides the assets and liabilities carried at fair value, measured as of March 31, 2014 and 2013 (in thousands):

	Total		Quoted Prices in		Significant Other		Significant
	Carrying		Active Markets		Observable Inputs		Unobservable Inputs
	Value		(Level 1)		(Level 2)		(Level 3)
March 31, 2014:
Assets:
Cash equivalents	$	17,675	$	17,675	$	-	$	-
Derivative liabilities:
Warrants	$	2,601	$	-	$	-	$	2,601

	Total		Quoted Prices in		Significant Other		Significant
	Carrying		Active Markets		Observable Inputs		Unobservable Inputs
	Value		(Level 1)		(Level 2)		(Level 3)
March 31, 2013:
Assets:
Cash equivalents	$	18,649	$	18,649	$	-	$	-
Derivative liabilities:
Derivative liability	$	529	$	-	$	-	$	529
Warrants	$	3,633	$	-	$	-	$	3,633

The table below reflects the activity for the Company’s major classes of liabilities measured at fair value for the years ended March 31, 2014 and 2013 (in thousands):

	Derivative
	Liability			Warrants
April 1, 2013	$	529		$	3,633
Warrant issuance with Senior Secured Term Loan		-			315
Mark to market adjustment		(525	)		(1,347	)
Extinguishment of derivative liability		(4	)		-
Balance at March 31, 2014	$	-		$	2,601

	Derivative
	Liability			Warrants
April 1, 2012	$	-		$	-
Valuation of original derivative liability		3,779			-
Warrant issuance with Senior Convertible Note		-			7,018
Warrant issuance with Senior Secured Term Loan		-			380
Valuation of derivative liability attributable to modification		542			-
Mark to market adjustment		(3,792	)		(3,765	)
Balance at March 31, 2013	$	529		$	3,633

The following table provides the assets and liabilities measured at fair value on a non-recurring basis, as of March 31, 2014 (in thousands):

	Total		Quoted Prices in	Significant Other	Significant
	Carrying		Active Markets	Observable Inputs	Unobservable Inputs
	Value		(Level 1)	(Level 2)	(Level 3)
March 31, 2014:
Assets:
Investment in unconsolidated entity – Blade Dynamics	$	3,690	$	$	$	3,690

Valuation Techniques

Cash Equivalents

Derivative Liability

The Company had identified all of the derivatives (“Derivative Liability”) associated with the extinguished Exchanged Note which include holder change of control redemption rights, issuer optional redemption rights, sale redemption rights and a feature to convert the Exchanged Note into equity at the holder’s option. The Derivative Liability was subject to revaluation at each balance sheet date, and any change in fair value was recorded as a change in fair value in other income (expense) until its expiration. The Company relied on assumptions in a lattice model to determine the fair value of Derivative Liability. The Company had appropriately valued the Derivative Liability within Level 3 of the valuation hierarchy. (See Note 9, “Debt,” for discussion on the Exchanged Note, Derivative Liability and valuation assumptions used.)

Warrants

Warrants were issued in conjunction with the Initial Note and the Term Loan. (See Note 9, “Debt,” for additional information on warrants.) These warrants are subject to revaluation at each balance sheet date, and any change in fair value will be recorded as a change in fair value in other income (expense) until the earlier of their exercise or expiration.

The Company relies on various assumptions in a lattice model to determine the fair value of warrants. The Company has appropriately valued the warrants within Level 3 of the valuation hierarchy. (See Note 10, “Warrants and Derivative Liabilities,” for a discussion of the warrants and the valuation assumptions used.)

Minority Investment

The Company accounts for the minority investment in Blade Dynamics on a cost basis (See Note 15, “Minority Investments”). During the year ended March 31, 2014, the Company determined that as a result of its efforts to sell its investment in Blade Dynamics, certain indicators of impairment existed which required the Company to perform further analysis. Based on analysis which included potential sale scenarios of the investment, the Company recorded an impairment charge of approximately $1.3 million and reported the investment at its estimated fair value in the fourth quarter ended March 31, 2014.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References+ Details

Accounts Receivable

12 Months Ended

Mar. 31, 2014

Accounts Receivable

4. Accounts Receivable

Accounts receivable at March 31, 2014 and 2013 consisted of the following (in thousands):

	March 31,			March 31,
	2014			2013
Accounts receivable (billed)	$	6,113		$	17,222
Accounts receivable (unbilled)		1,459			1,642
Less: Allowance for doubtful accounts		(16	)		-
Accounts receivable, net	$	7,556		$	18,864

As of March 31, 2014, three customers, Inox, CGPS, and JCNE, accounted for approximately 20%, 14% and 13%, respectively, of the Company’s total receivable balance. As of March 31, 2013, three customers, Inox, CGPS, and HHI, accounted for approximately 41%, 17% and 11%, respectively, of the Company’s total receivable balance.

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

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Inventory

12 Months Ended

Mar. 31, 2014

Inventory

5. Inventory

Inventory at March 31, 2014 and 2013 consisted of the following (in thousands):

	March 31,		March 31,
	2014		2013
Raw materials	$	3,304	$	5,966
Work-in-process		4,047		3,427
Finished goods		10,275		21,655
Deferred program costs		3,068		2,425
Net inventory	$	20,694	$	33,473

For the year ended March 31, 2014, the Company recorded an inventory write-down of approximately $0.3 million based on evaluating its ending inventory on hand for excess quantities and obsolescence. For the year ended March 31, 2013, the Company recorded an inventory write-down of approximately $2.2 million based on its evaluation of forecasted demand in relation to the inventory on hand and market conditions surrounding its products as a result of the assumption that Sinovel and certain other customers in China will fail to meet their contractual obligations under existing supply agreements and demand that was previously forecasted will fail to materialize.

Deferred program costs as of March 31, 2014 and 2013 primarily represent costs incurred on programs accounted for under contract accounting where revenue and costs will be recognized when the Company completes the development programs.

- Definition

The entire disclosure for inventory. This may include, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the major classes of inventory, and the nature of the cost elements included in inventory. If inventory is stated above cost, accrued net losses on firm purchase commitments for inventory and losses resulting from valuing inventory at the lower-of-cost-or-market may also be included. For LIFO inventory, may disclose the amount and basis for determining the excess of replacement or current cost over stated LIFO value and the effects of a LIFO quantities liquidation that impacts net income.

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Property, Plant and Equipment

12 Months Ended

Mar. 31, 2014

Property, Plant and Equipment

6. Property, Plant and Equipment

The cost and accumulated depreciation of property and equipment at March 31, 2014 and 2013 are as follows (in thousands):

	March 31,
	2014			2013
Land	$	3,643		$	3,643
Construction in progress - equipment		117			14,505
Buildings		34,341			34,398
Equipment and software		83,861			71,116
Furniture and fixtures		1,353			1,626
Leasehold improvements		5,211			5,556
Property, plant and equipment, gross		128,526			130,844
Less accumulated depreciation		(63,952	)		(56,218	)
Property, plant and equipment, net	$	64,574		$	74,626

Depreciation expense was $9.9 million, $12.1 million, and $12.9 million, for the years ended March 31, 2014, 2013, and 2012, respectively. (See Note 16, “Restructuring and Impairments,” for additional information regarding the effect the Company’s restructuring plan had on property, plant and equipment.)

- Definition

The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures.

+ References+ Details

Intangible Assets

12 Months Ended

Mar. 31, 2014

Intangible Assets

7. Intangible Assets

Intangible assets at March 31, 2014 and 2013 consisted of the following (in thousands):

	2014							2013
	Gross		Accumulated			Net Book		Gross		Accumulated			Net Book		Estimated
	Amount		Amortization			Value		Amount		Amortization			Value		Useful Life
Licenses	$	4,473	$	(2,962	)	$	1,511	$	5,349	$	(3,366	)	$	1,983	7
Trade names and trademarks		1,250		(1,250	)		-		1,165		(1,040	)		125	7
Core technology and know-how		5,736		(5,252	)		484		5,453		(4,812	)		641	5-10
Intangible assets	$	11,459	$	(9,464	)	$	1,995	$	11,967	$	(9,218	)	$	2,749

The Company recorded intangible amortization expense of $0.8 million, $0.9 million, and $2.6 million for the years ended March 31, 2014, 2013, and 2012, respectively. During the fourth quarter of the year ended March 31, 2012, the Company elected to change its accounting policy for legal costs to defend and maintain its patents. Historically, the Company capitalized these costs and amortized them over the useful lives of the patents. At that time, the Company determined a change to expense these costs as incurred is preferable, and elected to make that change by expensing the remaining unamortized patent costs of $4.9 million during the year ended March 31, 2012.

Expected future amortization expense related to intangible assets is as follows (in thousands):

For the years ended March 31,	Total
2015	$	573
2016		568
2017		553
2018		301
Total	$	1,995

The geographic composition of intangible assets is as follows (in thousands):

	March 31,
	2014		2013
Intangible assets by geography:
U.S.	$	1,995	$	2,624
Europe		-		125
Total	$	1,995	$	2,749

The business segment composition of intangible assets is as follows (in thousands):

	March 31,
	2014		2013
Intangible assets by business segments:
Wind	$	-	$	152
Grid		1,995		2,597
Total	$	1,995	$	2,749

Accounts Payable and Accrued Expenses

12 Months Ended

Mar. 31, 2014

Accounts Payable and Accrued Expenses

8. Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses consisted of the following (in thousands):

	March 31,
	2014		2013
Accounts payable	$	1,749	$	7,146
Accrued inventories in-transit		212		779
Accrued miscellaneous expenses		6,076		9,172
Accrued outside services		3,716		2,251
Accrued subcontractor program costs		290		2,442
Accrued compensation		5,939		5,506
Income taxes payable		173		133
Accrued adverse purchase commitments		402		1,440
Accrued warranty		3,207		2,709
Total	$	21,764	$	31,578

Product Warranty

The Company generally provides a one to three year warranty on its products, commencing upon installation. A provision is recorded upon revenue recognition to cost of revenues for estimated warranty expense based on historical experience. The following is a summary of accrued warranty activity (in thousands):

	For the years ended
	March 31,
	2014			2013
Balance at beginning of period	$	2,709		$	5,896
Change in accruals for warranties during the period		1,717			1,371
Settlements during the period		(1,219	)		(4,558	)
Balance at end of period	$	3,207		$	2,709

Debt

12 Months Ended

Mar. 31, 2014

Debt

9. Debt

Senior Convertible Note

On April 4, 2012, the Company entered into a Securities Purchase Agreement with CVI, an affiliate of Heights Capital Management (the “Purchase Agreement”) and completed a private placement of (the “Initial Note”), a 7% unsecured senior convertible note. After fees and expenses, the net proceeds of the Initial Note were $23.2 million. The Initial Note had an initial conversion price of $4.85 per share, representing a premium of approximately 20% over AMSC’s closing price on April 3, 2012. The Initial Note was payable in monthly installments beginning four months from issuance and ending on October 4, 2014. Monthly payments were payable in cash or the Company’s common stock at the option of the Company, subject to certain trading volume, stock price and other conditions. CVI could have also elected to defer receipt of monthly installment payments at its option. Any deferred installment payments would have continued to accrue interest. The Company registered 10,262,311 shares of common stock which may be used as payment for principal and interest in lieu of cash for resale under the Securities Act as required under a Registration Rights Agreement with CVI.

The Company accounted for the Initial Note as an instrument that has the characteristics of a debt host contract containing several embedded derivative features that would require bifurcation and separate accounting as a derivative instrument pursuant to the provisions of ASC 815. The Company elected not to use the fair value option for the aggregate amount of the Initial Note and recorded the liability at its stated value on the date of issuance with no changes in fair value reported in subsequent periods.

The Company identified the following derivatives associated with the Initial Note: holder change of control redemption rights; issuer optional redemption rights; sale redemption rights and a feature to convert the Initial Note into equity at the holder’s option. The Company valued these derivatives at $3.8 million upon issuance of the Initial Note. (See Note 10, “Warrants and Derivative Liabilities,” for additional information regarding derivative liabilities.)

In conjunction with the Initial Note, CVI received a warrant to purchase approximately 3.1 million additional shares of common stock exercisable at a strike price of $5.45 per share, subject to adjustment, until October 4, 2017. Due to certain adjustment provisions within the warrant, it qualified for liability accounting and had a fair value of $7.0 million upon issuance. The Company recorded the value as a debt discount and a warrant liability. (See Note 10, “Warrants and Derivative Liabilities,” for additional information regarding the warrant.)

The process of valuing financial and derivative instruments utilizes facts and circumstances as of the measurement date as well as certain inputs, assumptions, and judgments that may affect the estimated fair value of the instruments. Upon issuance of the Initial Note, the Company determined the initial carrying value of the Initial Note to be $25.0 million. In addition, the Company also incurred $1.8 million of legal and origination costs, which have been recorded as a discount on the Initial Note.

On December 20, 2012, the Company entered into an Amendment and Exchange Agreement, (the “Amendment”) with CVI, which amended the Purchase Agreement. Pursuant to the Amendment, the Company and CVI exchanged the Initial Note for the Exchanged Note. At the time of the exchange, the Exchanged Note had the same principal amount and accrued interest as the Initial Note. The Exchanged Note was convertible into the Company’s common stock and had the same scheduled monthly installment payments as the Initial Note. The Exchanged Note provided the Company with additional flexibility to make monthly installment payments in shares of the Company’s common stock. The Company retained the ability to repay the Exchanged Note in cash. Specifically, the amendments to the Exchanged Note:

Allowed the Company to convert, subject to the satisfaction of certain conditions set forth in the Exchanged Note, (a) at least $2.5 million of the approximately $5.3 million installment amount payable with respect to the January 2013 installment date (including approximately $4.2 million of deferred installment amounts from the period September 4, 2012 to December 3, 2012) into shares of the Company’s common stock (on December 21, 2012 the Company converted $3.8 million in deferred installment amount principal and interest and issued 1,715,443 shares of common stock), and (b) the balance of the January 2013 installment amount in equal amounts on each of the February and March 2013 installment dates;

·	Reduced the price failure equity condition with respect to a particular date of determination from $2.50 to $1.00;

Reduced the aggregate daily dollar trading volume equity condition required for at least 25 of the 30 consecutive trading days immediately preceding a date of determination from $1,500,000 to $850,000 per trading day. In addition, if the aggregate daily dollar trading volume was between $50,000 and $850,000, the Company could have still converted into common stock a portion of an installment amount payable with respect to an installment date equal to the quotient of (x) the aggregate daily dollar trading volume, divided by (y) $850,000;

·	Increased CVI’s beneficial ownership limitation under the Exchanged Note from 4.99% to 9.99%; and

·	Reduced the conversion price, from $4.85 per share of the Company’s common stock to $3.19 per share of the Company’s common stock, subject to certain price-based and other anti-dilution adjustments.

The Company assessed the changes in the Exchanged Note and accounted for it as a modification of the Initial Note. Therefore, the Company determined the incremental value of the derivative instruments, as a result of the Exchanged Note, as having a reduced conversion price. As a result of the re-valuation, the Company recorded a $0.5 million increase in the value of the derivative liability and additional debt discount. At the modification date, the value of the derivative liability was $1.5 million. The total debt discount, including the embedded derivatives in the Initial Note, the incremental value of embedded derivatives in the Exchanged Note, warrant and legal and origination costs of $13.1 million was amortized into interest expense over the term of the Exchanged Note using the effective interest method. Under this method, interest expense was recognized each period until the debt instruments reached maturity. Given that the maturity of the Exchanged Note was accelerated due to prepayment, the amortization was accelerated.

On October 9, 2013, the Company entered into a Second Amendment and Warrant Exchange Agreement (the “Second Amendment”) with CVI. The Second Amendment further amended the Securities Purchase Agreement, as amended by the First Amendment (collectively, the “Amended Purchase Agreement”), that the Company previously entered into with CVI.

Pursuant to the Second Amendment, the Company and/or CVI waived certain provisions of the Amended Purchase Agreement and amended certain provisions of the Exchanged Note, specifically:

CVI waived its rights under the Amended Purchase Agreement to participate in (i) specific types of offerings that may be conducted by the Company with respect to the Company’s currently effective Registration Statement on Form S-3 (Registration No. 333-191153), and (ii) the issuance of shares of common stock in connection with any settlement of currently outstanding litigation involving the Company;

·	the Company and CVI amended the Exchanged Note:

—

to increase the period during which CVI is allowed to accelerate payment in shares of common stock at the then current installment date conversion price from such installment date until the trading day before the next installment notice due date to the entire period from such installment date until the trading day before the next installment date;

—	to increase the aggregate outstanding principal amount under the definition of “permitted senior indebtedness” from $10.0 million to $15.0 million; and

·	the Company and CVI exchanged the warrant (the “Original Warrant”) for a new warrant (the “Exchanged Warrant”) with a reduced exercise price of $2.61 per share of common stock.

The Company assessed the changes to the Exchanged Note included in the Second Amendment and accounted for it as a modification of the Exchanged Note. Therefore, the Company determined the incremental value of the derivative instruments, as a result of the Second Amendment, specifically the Exchanged Warrant. See Note 10 “Warrants and Derivative Liabilities” for discussion of the valuation of the Exchanged Warrant.

During the years ended March 31, 2014 and 2013, the Company recorded non-cash interest expense for amortization of the debt discount related to the convertible notes of $4.1 million and $8.2 million respectively.

Provided certain equity conditions were met, the Company could elect to repay principal and interest in shares of the Company’s common stock. If the Company elected to make a payment in shares of the Company’s common stock, the number of shares issued was determined by dividing the amount of such payment by 85% of the lessor of the average volume-weighted average price (“VWAP”) of the 10 consecutive days immediately preceding the payment date or the VWAP price on the day preceding the payment date (the “Market Price”). The Company recorded the difference between the closing price of its common stock on the day preceding the payment date and the Market Price as a discount on the fair value of its shares. During the year ended March 31, 2014, the Company recorded $2.9 million of non-cash interest expense related to installment payments made by issuing the Company’s common stock at a discount, compared to $3.6 million during the year ended March 31, 2013.

On March 2, 2014, the Company entered into an Exchange Agreement with CVI, pursuant to which the Company exchanged the Exchanged Note for approximately 6.6 million shares of common stock and extinguished the debt. As a result of this transaction, the Company recorded a loss on the extinguishment of debt of $5.2 million during the three months ended March 31, 2014.

Senior Secured Term Loan

On June 5, 2012, the Company entered into a Term Loan with Hercules Technology Growth Capital, Inc. (“Hercules”), under which the Company borrowed $10.0 million. After the closing fees and expenses, the net proceeds to the Company were $9.7 million. The Term Loan bears an interest rate equal to 11% plus the percentage, if any, by which the prime rate as reported by The Wall Street Journal exceeds 3.75%. The Company made interest-only payments from July 1, 2012 through October 31, 2012, after which the Company repays the loan in equal monthly installments ending on December 1, 2014. The Term Loan is secured by substantially all of the Company’s existing and future assets, including a mortgage on real property owned by the Company’s wholly-owned subsidiary, ASC Devens LLC, and located at 64 Jackson Road, Devens, Massachusetts. In addition, Hercules received a warrant to purchase 139,276 shares of common stock, exercisable at an initial strike price of $3.59 per share, subject to adjustment, until December 5, 2017. Due to certain adjustment provisions within the warrant, it qualified for liability accounting and the fair value of $0.4 million was recorded upon issuance, which the Company recorded as a debt discount and a warrant liability. (See Note 10, “Warrants and Derivative Liabilities,” for a discussion on warrants and the valuation assumptions used.) The Company will pay an end of term fee of $0.5 million upon the earlier of maturity or prepayment of the loan. The Company accrued this as of the year ended March 31, 2013 and recorded a corresponding amount into the debt discount. In addition, the Company incurred $0.3 million of legal and origination costs in the year ended March 31, 2013, which were recorded as a debt discount. The total debt discount including the warrant, end of term fee and legal and origination costs of $1.2 million is being amortized into interest expense over the term of the Term Loan using the effective interest method. Under this method, interest expense is recognized each period until the debt instrument reaches maturity. If the maturity of the Term Loan is accelerated because of prepayment, then the amortization will be accelerated. During the years ended March 31, 2014 and 2013, the Company recorded non-cash interest expense for amortization of the debt discount related to the Term Loan of $0.5 million and $0.6 million, respectively.

On November 15, 2013, the Company amended the Term Loan with Hercules and entered into a New Term Loan, borrowing an additional $10.0 million. After closing fees and expenses, the net proceeds to the Company for the New Term Loan were $9.8 million. The New Term Loan also bears the same interest rate as the Term Loan. The Company is making interest-only payments from December 1, 2013 to May 31, 2014. If the Company achieved certain revenue targets for the six-month period ending March 31, 2014, interest only payments would continue through August 31, 2014. The Company did not achieve the revenue required to extend the interest-only period. Beginning June 1, 2014, the Company will repay the New Term Loan in equal monthly installments ending on November 1, 2016. Hercules received a warrant (the “Second Warrant”) to purchase 256,410 shares of common stock, exercisable at an initial strike price of $1.95 per share, subject to adjustment, until May 15, 2019. In addition, the exercise price of the First Warrant was reduced to $1.95 per share. (See Note 10, “Warrants and Derivative Liabilities,” for a discussion on both warrants and the valuation assumptions used.) The Company will pay an end of term fee of $0.5 million upon the earlier of maturity or prepayment of the New Term Loan. The Company has accrued the end of term fee and recorded a corresponding amount into the debt discount. The New Term Loan includes a mandatory prepayment feature which allows Hercules the right to use any of the Company’s net proceeds from specified asset dispositions greater than $1.0 million in a calendar year to pay off any outstanding accrued interest and principal balance on the New Term Loan. The Company determined the fair value to be de-minimis for this feature. In addition, the Company incurred $0.2 million of legal and origination costs in the year ended March 31, 2014, which have been recorded as a debt discount. The total debt discount including the Second Warrant, end of term fee and legal and origination costs of $1.0 million is being amortized into interest expense over the term of the New Term Loan using the effective interest method. If the maturity of either of the term loans is accelerated because of prepayment, then the amortization will be accelerated. During the year ended March 31, 2014, the Company recorded non-cash interest expense for amortization of the debt discount related to the New Term Loan of $0.2 million.

The Term Loans are secured by substantially all of the Company’s existing and future assets, including a mortgage on real property owned by the Company’s wholly-owned subsidiary, ASC Devens LLC, and located at 64 Jackson Road, Devens, Massachusetts. The Term Loans contain certain covenants that restrict the Company’s ability to, among other things, incur or assume certain debt, merge or consolidate, materially change the nature of the Company’s business, make certain investments, acquire or dispose of certain assets, make guaranties or grant liens on its assets, make certain loans, advances or investments, declare dividends or make distributions or enter into transactions with affiliates. In addition, there is a covenant that requires the Company to maintain a minimum unrestricted cash balance (“Minimum Threshold”) in the United States of at least $15.0 million at the inception of the New Term Loan. The Minimum Threshold amount is reduced by $2.5 million for every $5.0 million of net proceeds from the sale of its common stock after November 15, 2013, including those under the ATM, to an amount not lower than $7.5 million or the outstanding combined principal balances of the Term Loans, whichever is lower. As of March 31, 2014, the Minimum Threshold was $12.5 million. The events of default under the Term Loans include, but are not limited to, failure to pay amounts due, breaches of covenants, bankruptcy events, cross defaults under other material indebtedness and the occurrence of a material adverse effect and/or change in control. In the case of a continuing event of default, Hercules may, among other remedies, declare due all unpaid principal amounts outstanding and any accrued but unpaid interest and foreclose on all collateral granted to Hercules as security under the Term Loans.

Although the Company believes that it is in and expects to remain in compliance with the covenants and restrictions under the Term Loans as of the date of this Annual Report on Form 10-K, there can be no assurance that the Company will continue to be in compliance.

Interest expense on the Exchanged Note and Term Loans for the years ended March 31, 2014 and 2013 was $9.7 million and $14.9 million respectively, which included $7.7 million and $12.4 million, of non-cash interest expense related to the amortization of the debt discount on the Exchanged Note and Term Loans and payment of the Exchanged Note in Company common stock at a discount, respectively.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References+ Details

Warrants and Derivative Liabilities

12 Months Ended

Mar. 31, 2014

Warrants and Derivative Liabilities

10. Warrants and Derivative Liabilities

On April 4, 2012, the Company entered into the Purchase Agreement for the Initial Note and on December 20, 2012, the Company entered into the First Amendment pursuant to which it exchanged the Initial Note for the Exchanged Note (See Note 9, “Debt” for further discussion). The Initial Note included a warrant to purchase 3,094,060 shares of the Company’s common stock. The warrant is exercisable at any time on or after the date that is six months after the issuance of the warrant and entitles CVI to purchase shares of the Company’s common stock for a period of five years from the initial date the warrant becomes exercisable at a price equal to $5.45 per share, subject to certain price-based and other anti-dilution adjustments. On October 9, 2013, the Company entered into the Second Amendment with CVI. Pursuant to the Second Amendment, the Company exchanged the Original Warrant for the Exchanged Warrant, with a reduced exercise price of $2.61 per share of common stock. Other than the reduced exercise price, the Exchanged Warrant has the same terms and conditions as the Original Warrant. The Company recorded a charge of approximately $1.0 million for the increase in fair value of the Exchanged Warrant resulting from the Second Amendment on the warrant liability during the three months ending December 31, 2013. As a result of the sales of common stock under the ATM (See Note 12, “Stockholders’ Equity”, for further discussion of the ATM) during the year ended March 31, 2014, the exercise price of the Exchanged Warrant was reduced to $2.58 per share. The Exchanged Warrant may not be exercised if, after giving effect to the conversion, CVI together with its affiliates would beneficially own in excess of 4.99% of the Company’s common stock. This percentage may be raised to any other percentage not in excess of 9.99% at the option of CVI, upon at least 61-days prior notice to the Company, or lowered to any other percentage, at the option of CVI, at any time.

The Company calculated the fair value of the derivative liabilities and warrants utilizing an integrated lattice model. The lattice model is an option pricing model that involves the construction of a binomial tree to show the different paths that the underlying asset may take over the option’s life. A lattice model can take into account expected changes in various parameters such as volatility over the life of the options, providing more accurate estimates of option prices than the Black-Scholes model.

The Company accounts for the warrant as a liability due to certain adjustment provisions within the warrant, which requires that it be recorded at fair value. The warrant is subject to revaluation at each balance sheet date and any change in fair value will be recorded as a change in fair value in other income (expense) until the earlier of expiration or its exercise at which time the warrant liability will be reclassified to equity.

Following is a summary of the key assumptions used to calculate the fair value of the warrant:

							Post-modification			Pre-modification
	March 31,			December 31,			October 9,			October 9,			September 30,			June 30,
Fiscal Year 13	2014			2013			2013			2013			2013			2013

Risk-free interest rate		1.11	%		1.17	%		1.05	%		1.05	%		1.02	%		1.13	%
Expected annual dividend yield		—	%		—	%		—	%		—	%		—	%		—	%
Expected volatility		81.0	%		75.6	%		71.5	%		71.5	%		72.0	%		71.9	%
Term (years)	3.51			3.76			3.99			3.99				4.01			4.27
Fair value	$ 2.2 million			$ 2.2 million			$ 3.2 million			$ 2.2 million			$ 2.5 million			$ 3.0 million

	March 31,			December 31,			September 30,			June 30,			April 4,
Fiscal Year 12	2013			2012			2012			2012			2012

Risk-free interest rate		0.67	%		0.75	%		0.63	%		0.77	%		1.19	%
Expected annual dividend yield		—	%		—	%		—	%		—	%		—	%
Expected volatility		71.7	%		80.6	%		80.9	%		80.8	%		80.0	%
Term (years)		4.51			4.76			5.01			5.28			5.50
Fair value	$ 3.4 million			$ 4.4 million			$ 7.1 million			$ 8.6 million			$ 7.0 million

The Company recorded gains for the change in the fair value of the CVI warrant, including the impact of the modification of $1.2 million and $3.6 million to change in fair value of derivatives and warrants in the years ended March 31, 2014 and 2013 respectively.

Convertible Note Derivative Liability

The Company determined certain embedded derivatives issued with the Initial Note required accounting as a liability, which requires they be accounted for as a standalone liability subject to revaluation at each balance sheet date with changes in fair value recorded as change in fair value of derivatives and warrants until the earlier of exercise or expiration.

The terms of the December 2012 debt modification with CVI reduced the conversion price of the Initial Note from $4.85 per share to $3.19 per share in the Exchanged Note. As a result the Company revalued these derivatives pre- and post-modification and recorded the difference of $0.5 million as a debt discount and a derivative liability. (See Note 9, “Debt,” for further discussion.) As a result of the sales of common stock under the ATM (See Note 12, “Stockholders’ Equity”, for further discussion of the ATM) during the year ended March 31, 2014, the conversion price of the Exchanged Note was reduced to $3.10 per share.

On March 2, 2014, the Company executed an agreement to extinguish the Exchanged Note in exchange for approximately 6.6 million shares of AMSC common stock, par value $0.01 per share, in full satisfaction of all amounts owed including any accrued interest. In addition, the Company extinguished the remaining value for the derivative liability identified with the Exchanged Note and any unamortized debt discount. (See Note 9, “Debt” for further discussion)

Following is a summary of the key assumptions used to value the convertible notes derivative feature:

	March 31,			December 31,			September 30,			June 30,
Fiscal Year 13	2014			2013			2013			2013

Principal outstanding (000's)	$ —			$	10,411		$	10,411		$	14,389
Stock price	N/A			$	1.64		$	2.34		$	2.64
Percentage volume condition met	— %				87.2	%		80.2	%		87.5	%
Expected volatility	— %				68.6	%		66.3	%		65.8	%
Risk free rate	— %				0.12	%		0.10	%		0.21	%
Bond yield	— %				16.5	%		15.5	%		16.7	%
Recovery rate	— %				35.0	%		35.0	%		37.0	%
Redeemable	N/A			yes			yes			yes
Total time (years)	—				0.75			1.00			1.26
Dilution effect	N/A			yes			yes			yes
Fair value	$ —			$ —			$ 0.2 million			$ 0.5 million
Fair value as a percent of par					0.02	%		0.7	%		3.3	%


							Post-modification			Pre-modification
	March 31,			December 31,			December 20,			December 20,			September 30,			June 30,			April 4,
Fiscal Year 12	2013			2012			2012			2012			2012			2012			2012

Principal outstanding (000's)	$	15,380		$	20,944		$	20,944		$	24,074		$	24,074		$	25,000		$	25,000
Stock price	$	2.67		$	2.62		$	2.95		$	2.95		$	4.15		$	4.68		$	3.97
Percentage volume condition met		80.5	%		94.5	%		94.9	%		28.6	%		51.0	%		75.2	%		85.9	%
Expected volatility		66.9	%		73.5	%		72.5	%		72.5	%		70.0	%		71.0	%		75.0	%
Risk free rate		0.20	%		0.23	%		0.25	%		0.25	%		0.23	%		0.33	%		0.44	%
Bond yield		16.5	%		16.5	%		16.5	%		16.5	%		15.0	%		16.0	%		15.0	%
Recovery rate		30.0	%		30.0	%		30.0	%		30.0	%		30.0	%		30.0	%		30.0	%
Redeemable	yes			yes			yes			yes			yes			yes			yes
Total time (years)		1.51			1.76			1.79			1.79			2.01			2.28			2.50
Dilution effect	yes			yes			yes			yes			yes			yes			yes
Fair value	$ 0.5 million			$ 1.0 million			$ 1.5 million			$ 0.9 million			$ 2.8 million			$ 4.5 million			$ 3.8 million
Fair value as a percent of par		3.4	%		4.9	%		7.1	%		3.9	%		11.4	%		17.9	%		15.1	%

Based on historical volume-weighted average price (“VWAP”) of the Company’s common stock as well as the historic average dollar trading volume of the Company’s common stock, the percentage volume condition is the probability that the Company will convert monthly installment payments into the Company’s common stock. The expected volatility rate was estimated based on an equal weighting of the historical volatility of the Company’s common stock and the implied volatility of the Company’s traded options. To determine the risk-free interest rate, an interpolated rate was used based on the one, two and three-year United States Treasury rates. The bond yield was estimated using comparable corporate debt and yield information. The recovery rate of the Exchanged Note was estimated by reviewing historical corporate debt that went into default. The bond is redeemable by the Company at any point after the one-year anniversary of the grant date provided certain provisions within the note. The total time is based on the actual 30-month contractual terms. It was determined that there is a dilution effect based on the Company’s ability to make payments in shares of common stock.

The Company recorded gains from the change in the fair value of the derivative liabilities of $0.5 million and $3.8 million to changes in fair value of derivatives and warrants in the years ended March 31, 2014 and 2013, respectively.

Senior Secured Term Loan – First Warrant

On June 5, 2012, the Company entered into the Loan and Security Agreement with Hercules. (See Note 9, “Debt,” for additional information regarding the Loan and Security Agreement.) In conjunction with this agreement, the Company issued the First Warrant to purchase 139,276 shares of the Company’s common stock. The First Warrant is exercisable at any time after its issuance and expires on December 5, 2017, at a price equal to $3.59 per share subject to certain price-based and other anti-dilution adjustments. The exercise price was reduced to $1.95 per share in conjunction with entering into the New Term Loan.

The Company accounts for the warrant as a liability due to certain provisions within the warrant, which requires that it be recorded at fair value. The warrant is subject to revaluation at each balance sheet date and any change in fair value will be recorded as changes in fair value of derivatives and warrants until the earlier of expiration or its exercise at which time the warrant liability will be reclassified to equity.

Following is a summary of the key assumptions used to calculate the fair value of the warrant:

							Post-modification			Pre-modification
	March 31,			December 31,			November 15,			November 15,			September 30,			June 30,
Fiscal Year 13	2014			2013			2013			2013			2013			2013

Risk-free interest rate		1.18	%		1.24	%		1.00	%		1.00	%		1.09	%		1.20	%
Expected annual dividend yield		—	%		—	%		—	%		—	%		—	%		—	%
Expected volatility		80.73	%		74.79	%		72.64	%		72.64	%		72.10	%		72.30	%
Term (years)		3.68			3.93			4.05			4.05			4.18			4.43
Fair value	$ 0.1 million			$ 0.1 million			$ 0.1 million			$ 0.1 million			$ 0.2 million			$ 0.2 million



	March 31,			December 31,			September 30,			June 30,			June 5,
Fiscal Year 12	2013			2012			2012			2012			2012

Risk-free interest rate		0.70	%		0.75	%		0.64	%		0.80	%		0.77	%
Expected annual dividend yield		—	%		—	%		—	%		—	%		—	%
Expected volatility		72.01	%		80.14	%		81.18	%		80.32	%		79.99	%
Term (years)		4.68			4.93			5.18			5.44			5.50
Fair value	$ 0.2 million			$ 0.2 million			$ 0.4 million			$ 0.5 million			$ 0.4 million

The Company prepared its estimates for the assumptions used to determine the fair value of the warrants issued in conjunction with both the Convertible Note and Term Loan utilizing the respective terms of the warrants with similar inputs, as described above.

The Company recorded gains from the change in the fair value of the Hercules warrant of $0.1 million and $0.2 million during the years ended March 31, 2014 and 2013, respectively.

Senior Secured Term Loan – Second Warrant

On November 15, 2013, the Company amended the Loan and Security Agreement with Hercules and entered into the New Term Loan. (See Note 9, “Debt,” for additional information regarding the New Term Loan.) In conjunction with this agreement, the Company issued the Second Warrant to purchase 256,410 shares of the Company’s common stock. The Second Warrant is exercisable at any time after its issuance and expires on May 15, 2019, at a price equal to $1.95 per share subject to certain price-based and other anti-dilution adjustments.

The Company accounts for the Second Warrant as a liability due to certain provisions within the warrant, which requires that it be recorded at fair value. The Second Warrant is subject to revaluation at each balance sheet date and any change in fair value will be recorded as changes in fair value of derivatives and warrants until the earlier of expiration or its exercise at which time the warrant liability will be reclassified to equity.

Following is a summary of the key assumptions used to calculate the fair value of the Second Warrant:

							New Issuance
	March 31,			December 31,			November 15,
Fiscal Year 13	2014			2013			2013

Risk-free interest rate		1.76	%		1.89	%		1.55	%
Expected annual dividend yield		—	%		—	%		—	%
Expected volatility		79.73	%		80.37	%		76.97	%
Term (years)		5.12			5.37			5.49
Fair value	$ 0.3 million			$ 0.3 million			$ 0.3 million

The Company recorded no change in the fair value of the Second Warrant during the year ended March 31, 2014.

The Company prepared its estimates for the assumptions used to determine the fair value of the warrants issued in conjunction with both the Exchanged Note and Term Loans utilizing the respective terms of the warrants with similar inputs, as described above.

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4K

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+ Details

Income Taxes

12 Months Ended

Mar. 31, 2014

Income Taxes

11. Income Taxes

Income (loss) before income taxes for the years ended March 31, 2014, 2013, and 2012 are provided in the table as follows (in thousands):

	For the years ended March 31,
	2014			2013			2012
Income (loss) before income tax expense:
U.S.	$	(91,558	)	$	(66,975	)	$	(107,301	)
Foreign		36,152			580			(28,157	)
Total	$	(55,406	)	$	(66,395	)	$	(135,458	)

The components of income tax expense (benefit) attributable to continuing operations consist of the following (in thousands):

	For the years ended March 31,
	2014			2013			2012
Current
Federal	$	287		$	94		$	-
State		-			-			-
Foreign		614			(438	)		1,369
Total current		901			(344	)		1,369

Deferred
Federal		(49	)		93			-
State		-			-			-
Foreign		-			(13	)		-
Total deferred		(49	)		80			-

Income tax (benefit) expense	$	852		$	(264	)	$	1,369

The reconciliation between the statutory federal income tax rate and the Company’s effective income tax rate is shown below.

	For the years ended March 31,
	2014			2013			2012
Statutory federal income tax rate		(34	)%		(34	)%		(34	)%
State income taxes, net of federal benefit		-			(3	)		(2	)
Deemed dividend		1			2			3
Foreign income tax rate differential		(6	)		(2	)		3
Stock options		2			(2	)		1
Nondeductible expenses		1			1			-
Research and development tax credit		-			(1	)		(1	)
Deferred Warrants		(1)			-			-
Interest expense		5			7			-
Extinguishment of debt		3			-			-
Valuation allowance		30			32			31
Effective income tax rate		1	%		-	%		1	%

The following is a summary of the principal components of the Company’s deferred tax assets and liabilities (in thousands):

	For the years ended March 31,
	2014			2013
Deferred tax assets:
Net operating loss carryforwards	$	260,254		$	239,040
Research and development and other tax credit carryforwards		10,613			10,112
Accruals and reserves		36,214			35,490
Fixed assets and intangible assets		2,855			4,101
Other		19,594			18,292
Gross deferred tax assets		329,530			307,035
Valuation allowance		(282,824	)		(261,961	)
Total deferred tax assets		46,706			45,074

Deferred tax liabilities:
Intercompany debt		(36,102	)		(35,185	)
Other		(10,641	)		(9,979	)
Total deferred tax liabilities		(46,743	)		(45,164	)
Net deferred tax liabilities	$	(37	)	$	(90	)

The Company has provided a full valuation allowance against its net deferred income tax assets since it is more likely than not that its deferred tax assets are not currently realizable due to the net operating losses incurred by the Company since its inception and net operating losses forecasted in the future. The Company has recorded a deferred tax asset of approximately $13.9 million reflecting the benefit of deductions from the exercise of stock options. This deferred tax asset has been fully reserved since it is more likely than not that the tax benefit from the exercise of stock options will not be realized. The tax benefit will be recorded as a credit to additional paid-in capital if realized.

At March 31, 2014, the Company had aggregate net operating loss carryforwards in the U.S. for federal and state income tax purposes of approximately $718.0 million and $269.0 million, respectively, which expire in the years ending March 31, 2015 through 2034. Included in the U.S. net operating loss is $3.7 million of acquired losses from Power Quality Systems, Inc. and $52.4 million from excess tax deductions from stock option exercised in the years ending March 31, 2006 through 2014. Pursuant to the guidance on accounting for stock-based compensation, the deferred tax asset relating to excess tax benefits from these exercises was not recognized for financial statement purposes. The future benefit from these deductions will be recorded as a credit to additional paid-in capital when realized. Research and development and other tax credit carryforwards amounting to approximately $8.2 million and $2.4 million are available to offset federal and state income taxes, respectively, and will expire in the years ending March 31, 2015 through 2034.

At March 31, 2014, the Company had aggregate net operating loss carryforwards for its Austrian subsidiary, AMSC Austria GmbH, of approximately $70.0 million which can be carried forward indefinitely subject to certain annual limitations. At March 31, 2014, the Company had aggregate net operating loss carryforwards for its Chinese operation of approximately $28.0 million, which expire in the years ending March 31, 2017 and 2019. Also the Company had immaterial amounts of current and net operating loss carryforwards for its other foreign operations which can be carried forward indefinitely.

Section 382 of the U.S. Internal Revenue Code of 1986, as amended (the “IRC”), provides limits on the extent to which a corporation that has undergone an ownership change (as defined) can utilize any NOL and general business tax credit carryforwards it may have. The Company performed a study through February 25, 2010 to determine whether Section 382 could limit the use of its carryforwards in this manner. After completing this study, the Company has concluded that the limitation will not have a material impact on its ability to utilize its net operating loss carryforwards. If there was a material ownership change subsequent to the study it could limit the ability to utilize its net operating loss carryforwards.

The Company has not recorded a deferred tax asset for the temporary difference associated with the excess of its tax basis over the book basis in its Austrian subsidiary as the future tax benefit is not expected to reverse in the foreseeable future.

The Company has recorded a deferred tax liability as of March 31, 2014 for the undistributed earnings of its remaining foreign subsidiaries for which it can no longer assert are permanently reinvested. The total amount of undistributed earnings available to be repatriated at March 31, 2014 was $1.5 million resulting in the recording of a $0.5 million net deferred federal and state income tax liability.

Accounting for income taxes requires a two-step approach to recognizing and measuring uncertain tax positions. The first step is to evaluate the tax position for recognition by determining if, based on the technical merits, it is more likely than not that the position will be sustained upon audit, including resolution of related appeals or litigation processes, if any. The second step is to measure the tax benefit as the largest amount that is more than 50% likely of being realized upon ultimate settlement. The Company reevaluates these uncertain tax positions on a quarterly basis. This evaluation is based on factors including, but not limited to, changes in facts or circumstances, changes in tax law, effectively settled issues under audit and new audit activity. Any changes in these factors could result in the recognition of a tax benefit or an additional charge to the tax provision. The Company has gross unrecognized tax benefits of approximately $1.1 million at both March 31, 2014 and 2013. These amounts represent the amount of unrecognized tax benefits that, if recognized, would result in a reduction of the Company’s effective tax rate.

During the quarter ended September 30, 2011, the Company concluded a tax audit for the period January 1, 2006 through March 31, 2008 with its foreign subsidiary in Austria. The results of the audit concluded that previously deducted amounts for certain trade-mark and management fees related to corporate affairs charges would no longer be tax deductible.

A tabular roll-forward of the Company’s uncertainties in income tax provision liability is presented below (in thousands):

Balance at March 31, 2012	$	1,061
Increase for tax positions		-
Balance at March 31, 2013	$	1,061
Increase for tax positions		-
Balance at March 31, 2014	$	1,061

The Company accounts for interest and penalties related to uncertain tax positions as part of its provision for federal and state income taxes. Any unrecognized tax benefits, if recognized, would favorably affect its effective tax rate in any future period. The Company does not expect that the amounts of unrecognized benefits will change significantly within the next 12 months. Interest and penalties were recorded beginning in the year ended March 31, 2011 through March 31, 2014, but were immaterial amounts.

The Company conducts business globally and, as a result, its subsidiaries file income tax returns in the U.S. federal jurisdiction and various state and foreign jurisdictions. Major tax jurisdictions include the U.S., China and Austria. All U.S. income tax filings for years ending March 31, 1995 through 2014 remain open and subject to examination and all years from the year ended March 31, 2007 through 2014 remain open and subject to examination in Austria. Tax filings in China for calendar years 2008 through 2013 will remain open and subject to examination.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References+ Details

Stockholders' Equity

12 Months Ended

Mar. 31, 2014

Stockholders' Equity

12. Stockholders’ Equity

Stock-Based Compensation

The components of employee stock-based compensation for the years ended March 31, 2014, 2013 and 2012 were as follows (in thousands):

	For the Years Ended March 31,
	2014		2013		2012
Stock options	$	2,730	$	3,389	$	6,177
Restricted stock and stock awards		7,936		4,698		3,633
Employee stock purchase plan		30		51		54
Total stock-based compensation expense	$	10,696	$	8,138	$	9,864

The estimated fair value of the Company’s stock-based awards, less expected annual forfeitures, is amortized over the awards’ service period. The total unrecognized compensation cost for unvested outstanding stock options was $2.0 million and $3.5 million for the years ended March 31, 2014 and 2013, respectively. This expense will be recognized over a weighted-average expense period of approximately 1.5 years. The total unrecognized compensation cost for unvested outstanding restricted stock was $1.8 million and $5.8 million for the years ended March 31, 2014 and 2013, respectively. This expense will be recognized over a weighted-average expense period of approximately 0.6 years.

The following table summarizes employee stock-based compensation expense by financial statement line item for the years ended March 31, 2014, 2013 and 2012 (in thousands):

	2014		2013		2012
Cost of revenues	$	1,002	$	726	$	1,121
Research and development		2,751		2,456		2,562
Selling, general and administrative		6,943		4,956		6,181
Total	$	10,696	$	8,138	$	9,864

The following table summarizes the information concerning currently outstanding and exercisable employee and non-employee options:

						Weighted-
				Weighted-		Average
				Average		Remaining		Aggregate
	Options/			Exercise		Contractual		Intrinsic Value
	Shares			Price		Term		(thousands)
Outstanding at March 31, 2013		2,671,194		$	13.77
Granted at fair value		830,765			2.48
Exercised		-			-
Cancelled/forfeited		(560,121	)		11.93
Outstanding at March 31, 2014		2,941,838		$	10.93		6.7	$	-
Exercisable at March 31, 2014		1,484,288		$	15.22		5.0	$	-
Fully vested and expected to vest at March 31, 2014		2,836,755		$	11.15		6.6	$	-

The weighted-average grant-date fair value of stock option awards granted during the years ended March 31, 2014, 2013 and 2012 was $1.62 per share, $2.56 per share, and $6.02 per share, respectively. Intrinsic value represents the amount by which the market price of the common stock exceeds the exercise price of the options. Given the decline in the Company’s stock price, exercisable options as of March 31, 2014 and 2013 had no intrinsic value. The aggregate intrinsic value of exercisable options at March 31, 2012 was minimal. Given the decline in the Company’s stock price, the aggregate intrinsic value of options exercised at March 31, 2014, 2013 and 2012 was minimal.

The weighted average assumptions used in the Black-Scholes valuation model for stock options granted during the years ended March 31, 2014, 2013, and 2012 are as follows:

	For the Years Ended March 31,
	2014			2013			2012
Expected volatility		75.1	%		72.0	%		70.0	%
Risk-free interest rate		1.7	%		0.9	%		1.8	%
Expected life (years)		5.9			5.9			5.9
Dividend yield	None			None			None

The expected volatility rate was estimated based on an equal weighting of the historical volatility of the Company’s common stock and the implied volatility of the Company’s traded options. The expected term was estimated based on an analysis of the Company’s historical experience of exercise, cancellation, and expiration patterns. The risk-free interest rate is based on the average of the five and seven year U.S. Treasury rates.

The following table summarizes the employee and non-employee restricted stock activity for the year ended March 31, 2014:

				Weighted		Intrinsic
				Average		Aggregate
				Grant Date		Value
	Shares			Fair Value		(thousands)
Outstanding at March 31, 2013		2,404,825		$	4.58
Granted		1,945,610			2.30
Vested		(1,740,959	)		3.91
Forfeited		(194,112	)		3.54
Outstanding at March 31, 2014		2,415,364		$	3.34	$	3,889

The total fair value of restricted stock that was granted during the years ended March 31, 2014, 2013 and 2012 was $4.5 million, which includes $0.5 million for bonus and severance, $10.6 million, which includes $1.6 million for bonus and severance, and $5.6 million, respectively. The total fair value of restricted stock that vested during the years ended March 31, 2014, 2013 and 2012 was $3.7 million, which includes $0.5 million of bonus and severance, $3.4 million, which includes $1.6 million for bonus and severance, and $4.1 million, respectively.

The restricted stock granted during the years ended March 31, 2014, 2013 and 2012 includes approximately 402,015, 1,422,127 and 109,211 shares, respectively, of performance-based restricted stock, which would vest upon achievement of certain financial performance measurements. Included in the table above are 8,000 shares of restricted stock units outstanding.

The remaining shares granted vest upon the passage of time. For awards that vest upon the passage of time, expense is being recorded over the vesting period.

Stock-Based Compensation Plans

As of March 31, 2014, the Company had two active stock plans: the 2007 Stock Incentive Plan (the “2007 Plan”) and the 2007 Director Stock Option Plan (the “2007 Director Plan”). The 2007 Plan replaced the Company’s 2004 Stock Incentive Plan upon the approval by the Company’s stockholders on August 3, 2007. The 2007 Director Plan replaced the Second Amended and Restated 1997 Director Stock Option Plan, which expired pursuant to its terms on May 2, 2007.

The 2007 Plan provides for the grant of incentive stock options intended to qualify under Section 422 of the Internal Revenue Code of 1986, as amended, nonstatutory stock options, stock appreciation rights, restricted stock, restricted stock units and other stock-based awards. In the case of options, the exercise price shall be equal to at least the fair market value of the common stock, as determined by the Board of Directors, on the date of grant. The contractual life of options is generally 10 years. Options generally vest over a 3-5 year period while restricted stock generally vests over a 2-5 year period.

As of March 31, 2014, the 2007 Director Plan provided for the grant of nonstatutory stock options and stock awards to members of the Board of Directors who are not also employees of the Company (outside directors). Under the terms of the 2007 Director Plan as of March 31, 2014, each outside director was granted an option to purchase 10,000 shares of common stock upon his or her initial election to the Board with an exercise price equal to the fair market value of the Company’s common stock on the date of the grant. These options vest in equal annual installments over a two-year period. In addition, as of March 31, 2014, each outside director was granted an award of 3,000 shares of common stock three business days following each annual meeting of stockholders, provided that such outside director had served as a director for at least one year. Under the terms of the 2007 Director Plan effective April 1, 2014, each outside director is granted an option to purchase shares of common stock with an aggregate grant date value equal to $40,000 upon his or her initial election to the Board with an exercise price equal to the fair market value of the Company’s common stock on the date of the grant. These options vest in equal annual installments over a two-year period. In addition, effective April 1, 2014, each outside director is granted an award of shares of common stock with an aggregate grant date value equal to $40,000 three business days following the last day of each fiscal year, subject to proration for any partial fiscal year of service.

As of March 31, 2014, the 2007 Plan had 2,879,559 shares and the 2007 Director Plan had 159,000 shares available for future issuance.

Employee Stock Purchase Plan

The Company has an employee stock purchase plan (ESPP) which provides employees with the opportunity to purchase shares of common stock at a price equal to the market value of the common stock at the end of the offering period, less a 15% purchase discount. The Company recognized compensation expense of $0.1 million for each of the years ended March 31, 2014, 2013, and 2012, respectively, related to the ESPP. The Company issued 99,963 shares of common stock related to the ESPP during the year ended March 31, 2014. As of March 31, 2014, the ESPP had 239,306 shares available for future issuance.

ATM Arrangement

On November 15, 2013, the Company entered into an ATM arrangement, pursuant to which, the Company may, at its discretion, sell up to $30.0 million of the Company’s common stock through its sales agent, MLV & Co. LLC (“MLV”). Sales of common stock made under the ATM are made on The NASDAQ Global Market under the Company’s previously filed and currently effective Registration Statement on Form S-3 (File No. 333-191153) by means of ordinary brokers’ transactions at market prices. Additionally, under the terms of the ATM, the Company may also sell shares of its common stock through MLV, on The NASDAQ Global Market or otherwise, at negotiated prices or at prices related to the prevailing market price. Under the terms of the ATM, MLV may not engage in any proprietary trading or trading as principal for MLV’s own account. MLV uses its commercially reasonable efforts to sell the Company’s common stock from time to time, based upon the Company’s instructions (including any price, time or size limits or other customary parameters or conditions the Company may impose). The Company pays MLV a commission of up to 3% of the gross proceeds from the sale of shares of its common stock under the ATM. The Company has also agreed to provide MLV with customary indemnification rights. The offering of common stock pursuant to the ATM will terminate upon the earlier of the sale of all of the common stock subject to the ATM or the termination of the ATM by the Company or MLV. Either party may terminate the ATM at its sole discretion at any time upon written notice to the other party.

During the year ended March 31, 2014, the Company received net proceeds of $7.5 million, including sales commissions and offering expenses, from sales of approximately 4.9 million shares of its common stock at an average sales price of approximately $1.62 per share under the ATM. During the three months ended March 31, 2014, the Company received net proceeds of $4.1 million from sales of approximately 2.5 million shares of its common stock at an average sales price of approximately $1.74 per share.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 15: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644

Reference 16: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644

Reference 17: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644

Reference 18: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph d

-Article 4

Reference 19: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656

+ Details

Commitments and Contingencies

12 Months Ended

Mar. 31, 2014

Commitments and Contingencies

13. Commitments and Contingencies

Commitments

Purchase Commitments

The Company periodically enters into non-cancelable purchase contracts in order to ensure the availability of materials to support production of its products. Purchase commitments represent enforceable and legally binding agreements with suppliers to purchase goods or services. The Company periodically assesses the need to provide for impairment on these purchase contracts and record a loss on purchase commitments when required. As of March 31, 2014 and 2013, the Company recorded a liability for adverse purchase commitments of $0.4 million and $1.4 million, respectively. During the year ended March 31, 2013, the Company adjusted its accrual for adverse purchase commitments by $7.8 million, due primarily to settlements with vendors.

Lease Commitments

Operating leases include minimum payments under leases for the Company’s facilities and certain equipment; see Item 2, “Properties.” The Company’s primary leased facilities are located in Middleton and New Berlin, Wisconsin; Suzhou and Beijing, China; Klagenfurt, Austria; and Timisoara, Romania with a combined total of approximately 316,000 square feet of space. These leases have varying expiration dates through March 2021 which can generally be terminated at the Company’s request after a six month advance notice. The Company leases other locations which focus primarily on applications engineering, sales and/or field service and do not have significant leases or physical presence.

Minimum future lease commitments at March 31, 2014 were as follows (in thousands):

For the years ended March 31,	Total
2015	$	1,764
2016		1,166
2017		674
2018		423
2019		211
Thereafter		378
Total	$	4,616

Rent expense under the operating leases mentioned above was as follows (in thousands):

	For the years ended
	March 31,
	2014		2013		2012
Rent expense	$	2,152	$	2,437	$	3,336

Legal Contingencies

From time to time, the Company is involved in legal and administrative proceedings and claims of various types. The Company records a liability in its consolidated financial statements for these matters when a loss is known or considered probable and the amount can be reasonably estimated. The Company reviews these estimates each accounting period as additional information is known and adjusts the loss provision when appropriate. If a matter is both probable to result in a liability and the amounts of loss can be reasonably estimated, the Company estimates and discloses the possible loss or range of loss. If the loss is not probable or cannot be reasonably estimated, a liability is not recorded in its consolidated financial statements.

Between April 6, 2011 and May 12, 2011, seven putative securities class action complaints were filed against the Company and two of its officers in the United States District Court for the District of Massachusetts (the “Court”); one complaint additionally asserted claims against the underwriters who participated in its November 12, 2010 securities offering. On June 7, 2011, Court consolidated these actions under the caption Lenartz v. American Superconductor Corporation, et al., Docket No. 1:11-cv-10582-WGY. On August 31, 2011, Lead Plaintiff, the Plumbers and Pipefitters National Pension Fund, filed a consolidated amended complaint against the Company, its officers and directors, and the underwriters who participated in its November 12, 2010 securities offering, asserting claims under sections 10(b) and 20(a) of the Securities Exchange Act of 1934 (the “Exchange Act”) and Rule 10b-5 promulgated under the Exchange Act, as well as under sections 11, 12(a)(2) and 15 of the Securities Act of 1933, as amended (the “Securities Act”). The complaint alleged that during the relevant class period, the Company and its officers omitted to state material facts and made materially false and misleading statements relating to, among other things, its projected and recognized revenues and earnings, as well as its relationship with Sinovel Wind Group Co., Ltd. (“Sinovel”) that artificially inflated the value of the Company’s stock price. The complaint further alleged that the Company’s November 12, 2010 securities offering contained untrue statements of material facts and omitted to state material facts required to be stated therein. The plaintiffs seek unspecified damages, rescindment of the Company’s November 12, 2010 securities offering, and an award of costs and expenses, including attorney’s fees. All defendants moved to dismiss the consolidated amended complaint. On December 16, 2011, the Court issued a summary order declining to dismiss the Securities Act claims against the Company and its officers, and taking under advisement the motion to dismiss the Exchange Act claims against the Company and its officers and the motion to dismiss the Securities Act claims made against the underwriters. On July 26, 2012, the Court dismissed the Exchange Act claims against the Company and its officers and denied the motion to dismiss the Securities Act claims made against the underwriters. On November 19, 2013, the Company entered into a Stipulation and Agreement of Settlement (the “Stipulation”), which resolved the claims asserted against them, certain of its current and former officers and directors, and the underwriters. The terms of the Stipulation provide, among other things, a settlement payment by the Company of $10.0 million, $8.2 million of which will be funded by its insurers and $1.8 million of which is expected to be paid through the issuance of 944,882 shares of its common stock (the “Settlement Shares”). The terms of the Stipulation were subject to approval by the Court following notice to all class members. By order entered May 5, 2014, the Court approved the terms of the Stipulation and issued a final judgment dismissing this class action litigation. The effective date of the settlement is expected to be June 5, 2014. In the event that the value of the Settlement Shares (as calculated under the Stipulation) decreases as of the effective date of the settlement, the Company will be required to make a cash payment for the difference in value. As of March 31, 2013, the Company had established a reserve for the anticipated cost to settle this class action litigation. The issuance of the Settlement Shares is expected to be exempt from registration pursuant to Section 3(a)(10) of the Securities Act of 1933. Based on the Company’s assessment of the probable losses on this claim, the Company has recorded a loss contingency of $1.8 million as of March 31, 2014.

Between May 4, 2011 and June 17, 2011, four putative shareholder derivative complaints were filed against the Company (as a nominal defendant) and certain of its directors in the Court. On July 5, 2011, the Court consolidated three of these actions, and that matter was captioned In re American Superconductor Corporation Derivative Litigation, Docket No. 1:11-cv-10784-WGY. On June 1, 2011, the plaintiff in the fourth action, Marlborough Family Revocable Trust v. Yurek, et al., moved to voluntarily dismiss its complaint and refiled its complaint in Superior Court for the Commonwealth of Massachusetts, Middlesex County. On September 7, 2011, the Marlborough action and another putative shareholder derivative complaint filed in Superior Court for the Commonwealth of Massachusetts were consolidated. That consolidated matter was captioned In re American Superconductor Corporation Shareholder Derivative Litigation, Docket No. 11-1961. On January 12, 2012, an additional shareholder derivative complaint was filed in the Court of Chancery for the State of Delaware. That matter was captioned Krasnoff v. Budhraja, et al., Docket No. 7171. The allegations of the derivative complaints mirrored the allegations made in the putative class action complaints described above. The plaintiffs purported to assert claims against the director defendants for breach of fiduciary duty, abuse of control, gross mismanagement, unjust enrichment and corporate waste. On February 4, 2014, the Company entered into a Stipulation and Agreement of Settlement (the “Derivative Stipulation”) to settle In re American Superconductor Corporation Derivative Litigation, In re American Superconductor Corporation Shareholder Derivative Litigation, and Krasnoff v. Budhraja, et al., (together, the “Derivative Actions”). The Derivative Actions named certain current and former directors and officers as defendants. The current and former directors and officers named as individual defendants have denied expressly and continue to deny each and all of the claims and contentions alleged against them, and neither the individual defendants nor management has admitted any fault, wrongdoing or concession of liability in connection with the terms of the Derivative Stipulation. The Derivative Stipulation provides for, among other things, (a) a release of all claims relating to the Derivative Actions for the Company, the individual defendants, who are all current or former officers and directors, and the plaintiffs; (b) a requirement that the Company pay to plaintiffs’ counsel approximately $0.5 million for fees and expenses, which will be fully funded by its insurers; and (c) certain additions to its corporate governance policies, many of which have already been implemented. The terms of the Derivative Stipulation were subject to approval by the Court following notice to stockholders. By order entered May 8, 2014, the Court approved the terms of the Derivative Stipulation and issued a final judgment dismissing In re American Superconductor Corporation Derivative Litigation. Pursuant to the terms of the stipulation, the Company and the plaintiffs subsequently jointly sought and obtained dismissal of In re American Superconductor Corporation Shareholder Derivative Litigation, and Krasnoff v. Budhraja, et al. The effective date of the settlement is expected to be June 10, 2014. Based on the Company’s assessment that the probable losses on this claim are insignificant, no loss contingency was recorded.

On September 13, 2011, the Company commenced a series of legal actions in China against Sinovel. The Company’s Chinese subsidiary, Suzhou AMSC Superconductor Co. Ltd., filed a claim for arbitration with the Beijing Arbitration Commission in accordance with the terms of the Company’s supply contracts with Sinovel. The case is captioned (2011) Jing Zhong An Zi No. 0963. On March 31, 2011, Sinovel refused to accept contracted shipments of 1.5 MW and 3 MW wind turbine core electrical components and spare parts that the Company was prepared to deliver. The Company alleges that these actions constitute material breaches of its contracts because Sinovel did not give it notice that it intended to delay deliveries as required under the contracts. Moreover, the Company alleges that Sinovel has refused to pay past due amounts for prior shipments of core electrical components and spare parts. The Company is seeking compensation for past product shipments and retention (including interest) in the amount of approximately RMB 485.0 million ($76.0 million) due to Sinovel’s breaches of its contracts. The Company is also seeking specific performance of its existing contracts as well as reimbursement of all costs and reasonable expenses with respect to the arbitration. The value of the undelivered components under the existing contracts, including the deliveries refused by Sinovel in March 2011, amounts to approximately RMB 4.6 billion ($720.0 million).

On October 8, 2011, Sinovel filed with the Beijing Arbitration Commission an application under the caption (2011) Jing Zhong An Zi No. 0963, for a counterclaim against the Company for breach of the same contracts under which the Company filed its original arbitration claim. Sinovel claimed, among other things, that the goods supplied by the Company do not conform to the standards specified in the contracts and claimed damages in the amount of approximately RMB 370.0 million ($58.0 million). On October 17, 2011, Sinovel filed with the Beijing Arbitration Commission a request for change of counterclaim to increase its damage claim to approximately RMB 1.0 billion ($157.0 million). On December 22, 2011, Sinovel filed with the Beijing Arbitration Commission an additional request for change of counterclaim to increase its damages claim to approximately RMB 1.2 billion ($190.0 million). On February 27, 2012, Sinovel filed with the Beijing Arbitration Commission an application under the caption (2012) Jing Zhong An Zi No. 0157, against the Company for breach of the same contracts under which the Company filed its original arbitration claim. Sinovel claimed, among other things, that the goods supplied by the Company do not conform to the standards specified in the contracts and claimed damages in the amount of approximately RMB 105.0 million ($17.0 million). The Company believes that Sinovel’s claims are without merit and it intends to defend these actions vigorously. Since the proceedings in this matter are in relatively early stages, the Company cannot reasonably estimate possible losses or range of losses at this time.

The Company also submitted a civil action application to the Beijing No. 1 Intermediate People’s Court under the caption (2011) Yi Zhong Min Chu Zi No. 15524, against Sinovel for software copyright infringement on September 13, 2011. The application alleges Sinovel’s unauthorized use of portions of the Company’s wind turbine control software source code developed for Sinovel’s 1.5MW wind turbines and the binary code, or upper layer, of the Company’s software for the PM3000 power converters in 1.5MW wind turbines. In July 2011, a former employee of the Company’s Austrian subsidiary was arrested in Austria on charges of economic espionage and fraudulent manipulation of data. In September 2011, the former employee pled guilty to the charges, and was imprisoned. As a result of the Company’s internal investigation and a criminal investigation conducted by Austrian authorities, the Company believes that this former employee was contracted by Sinovel through an intermediary while employed by the Company and improperly obtained and transferred to Sinovel portions of its wind turbine control software source code developed for Sinovel’s 1.5MW wind turbines. Moreover, the Company believes the former employee illegally used source code to develop for Sinovel a software modification to circumvent the encryption and remove technical protection measures on the Company’s PM3000 power converters in 1.5MW wind turbines in the field. The Company is seeking a cease and desist order with respect to the unauthorized copying, installation and use of its software, monetary damages of approximately RMB 38.0 million ($6.0 million) for its economic losses and reimbursement of all costs and reasonable expenses. The Beijing No. 1 Intermediate People’s Court accepted the case, which was necessary in order for the case to proceed. In November 2011, Sinovel filed a motion to remove this case from the Beijing No. 1 Intermediate People’s Court and transfer the matter to the Beijing Arbitration Commission. On February 14, 2012, the court denied Sinovel’s motion to remove the case. On February 21, 2012, Sinovel filed an appeal of the Beijing No. 1 Intermediate People’s Court decision to the Beijing Higher People’s Court. On April 25, 2012, the Beijing Higher People’s Court issued a final Civil Ruling which supports the Beijing No.1 Intermediate People’s Court’s civil ruling and rejected Sinovel’s appeal. Sinovel filed an appeal of the Beijing Higher People’s Court’s decision with China’s Supreme People’s Court. A hearing regarding this appeal was held at the Chinese Supreme People’s Court on October 26, 2012. On November 23, 2012, China’s Supreme People’s Court issued a Civil Ruling, holding that (1) it will conduct a re-trial of Sinovel’s appeal, and (2) the lower court’s decision will be stayed pending the re-trial. China’s Supreme People’s Court conducted a re-trial of Sinovel’s appeal on May 29, 2013. On January 26, 2014, the Supreme People's Court ruled to uphold the Beijing Higher People's Court ruling that the dispute shall be heard by the court. The Company will now await a hearing date from the Beijing No. 1 Intermediate People's Court.

The Company submitted a civil action application to the Beijing Higher People’s Court against Sinovel and certain of its employees for trade secret infringement on September 13, 2011 under the caption (2011) Gao Min Chu Zi No. 4193. The application alleges the defendants’ unauthorized use of portions of the Company’s wind turbine control software source code developed for Sinovel’s 1.5MW wind turbines as described above with respect to the Copyright Action. The Company is seeking monetary damages of RMB 2.9 billion ($453.0 million) for the trade secret infringement as well as reimbursement of all costs and reasonable expenses. The Beijing Higher People’s Court accepted the case, which was necessary in order for the case to proceed. On December 22, 2011, the Beijing Higher People’s Court transferred the case to the Beijing No. 1 Intermediate People’s Court under the caption (2011) Gao Min Chu Zi No. 4193. On June 7, 2012, the Company received an Acceptance Notice from the Beijing No.1 Intermediate People’s Court under the caption (2012) Yi Zhong Min Chu Zi No.6833. In August 2012, Sinovel filed a motion to remove this case from the Beijing No. 1 Intermediate People’s Court and transfer the matter to the Beijing Arbitration Commission. On February 24, 2014, the Beijing No.1 Intermediate People’s Court denied Sinovel’s motion to remove the case. On March 13, 2014, Sinovel filed an appeal of the Beijing No. 1 Intermediate People’s Court decision to the Beijing Higher People’s Court. The Company is currently awaiting the final decision from the Beijing Higher People’s Court regarding the jurisdiction opposition issue.

On September 16, 2011, the Company filed a civil copyright infringement complaint in the Hainan Province No. 1 Intermediate People’s Court against Dalian Guotong Electric Co. Ltd. (“Guotong”), a supplier of power converter products to Sinovel, and Huaneng Hainan Power, Inc. (“Huaneng”), a wind farm operator that has purchased Sinovel wind turbines containing Guotong power converter products. The case is captioned (2011) Hainan Yi Zhong Min Chu Zi No. 62. The application alleges that the Company’s PM1000 converters in certain Sinovel wind turbines have been replaced by converters produced by Guotong. Because the Guotong converters are being used in wind turbines containing the Company’s wind turbine control software, the Company believes that its copyrighted software is being infringed. The Company is seeking a cease and desist order with respect to the unauthorized use of its software, monetary damages of RMB 1.2 million ($0.2 million) for its economic losses (with respect to Guotong only) and reimbursement of all costs and reasonable expenses. The court has accepted the case, which was necessary in order for the case to proceed. In addition, upon the request of the defendant Huaneng, Sinovel has been added by the court to this case as a defendant and Huaneng has been released from this case. In December 2011, Sinovel filed a jurisdiction opposition motion requesting dismissal by the Hainan Province No. 1 Intermediate People’s Court, saying the case should be governed by the Beijing Arbitration Commission. On February 3, 2012, the Company received the Civil Ruling from the court, which granted Sinovel’s motion, and dismissed the entire case. The Company appealed the court’s ruling to the Hainan Higher Court, which on April 5, 2012 upheld the decision of the Hainan Province No. 1 Intermediate People’s Court. On April 9, 2012, the Company filed an appeal of the Hainan Higher Court’s decision with China’s Supreme People’s Court. China’s Supreme People’s Court accepted the appeal on May 23, 2012. The case is captioned, (2012) Min Shen Zi No. 630. On December 20, 2012, China’s Supreme People’s Court issued a Civil ruling, holding that (1) it will conduct a re-trial of the Company’s appeal and (2) the lower court’s decision will be stayed pending the re-trial. China’s Supreme People’s Court conducted a re-trial of the Company’s appeal on May 29, 2013. On January 26, 2014, the Supreme People's Court revoked Hainan No. 1 Intermediate People’s Court and Hainan Higher People’s Court’s rulings and ruled that the case shall be heard by the Hainan No. 1 Intermediate People’s Court. The Hainan No. 1 Intermediate People’s Court accepted the case under the caption (2014) Hainan Yi Zhong Min Chu Zi No. 1.

Ghodawat Energy Pvt Ltd (“Ghodawat”), a company registered in India carrying on the business of wind power development, lodged a Request for Arbitration with the Secretariat of the ICC International Court of Arbitration (the “ICC Court”) on May 12, 2011 and named AMSC Windtec GmbH (“AMSC Austria”) as the Respondent. Under the Request for Arbitration, Ghodawat alleges that AMSC Austria breached an agreement dated March 19, 2008 pursuant to which AMSC Austria granted a license to Ghodawat to manufacture, use, sell, market, erect, commission and maintain certain wind turbines using its technical information and wind turbine design (the “License Agreement”). Under the Request for Arbitration, Ghodawat’s claims in this arbitration amount to approximately €18.0 million ($24.0 million). AMSC Austria filed an Answer to Request for Arbitration and Counterclaim, in which AMSC Austria denied Ghodawat’s claims in their entirety. AMSC Austria has also submitted counterclaims under the License Agreement against Ghodawat in the amount of approximately €6.0 million ($9.0 million). Ghodawat has filed a Reply to Answer to Request for Arbitration and Counterclaim in which it denies AMSC Austria’s counterclaims. On June 3, 2013, the final oral submission hearing was conducted. The final award is pending and the ICC Court has extended the time limit for the Tribunal to render a final award on a number of occasions. The Company expects that the award will be issued in 2014; however, it cannot assure you that the issuance of the award will not be delayed. The Company had recorded a loss contingency based on its assessment of probable losses on this claim; however, this amount is immaterial to its consolidated financial statements.

Other

The Company enters into long-term construction contracts with customers that require the Company to obtain performance bonds. The Company is required to deposit an amount equivalent to some or all the face amount of the performance bonds into an escrow account until the termination of the bond. When the performance conditions are met, amounts deposited as collateral for the performance bonds are returned to the Company. In addition, the Company has various contractual arrangements in which minimum quantities of goods or services have been committed to be purchased on an annual basis.

At March 31, 2014 and 2013, the Company had $2.9 million and $6.1 million, respectively, of restricted cash included in current assets, and $3.4 million and $4.8 million, respectively, of restricted cash included in long-term assets. These amounts included in restricted cash represent deposits to secure letters of credit for various supply contracts. These deposits are held in interest bearing accounts.

The Company had an unused, unsecured line of credit consisting of €2.7 million (approximately $3.7 million) in Austria as of March 31, 2014.

- Definition

The entire disclosure for commitments and contingencies.

+ References+ Details

Minority Investments

12 Months Ended

Mar. 31, 2014

Minority Investments

15. Minority Investments

Investment in Tres Amigas LLC

The Company made an investment in Tres Amigas LLC, a Delaware limited liability company (“Tres Amigas”), focused on providing the first common interconnection of America’s three power grids to help the country achieve its renewable energy goals and facilitate the smooth, reliable and efficient transfer of green power from region to region. The Company’s original investment in Tres Amigas was $5.4 million. As of March 31, 2014, the Company holds a 26% ownership interest in Tres Amigas.

The Company has determined that Tres Amigas is a variable interest entity (“VIE”) and that the Company is not the primary beneficiary of the VIE. Therefore, the Company has not consolidated Tres Amigas as of March 31, 2014. The investment is carried at acquisition cost, plus the Company’s equity in undistributed earnings or losses. The Company’s maximum exposure to loss is limited to the Company’s recorded investment in this VIE. The Company’s investment in Tres Amigas is included in other assets on the consolidated balance sheet and the equity in undistributed losses of Tres Amigas is included in other income, net, on the consolidated statements of operations.

The net investment activity for the year ended March 31, 2014 is as follows (in thousands):

Balance at April 1, 2013	$	2,853
Minority interest in net losses		(1,008	)
Balance at March 31, 2014	$	1,845

Investment in Blade Dynamics Ltd.

The Company has (through its Austrian subsidiary), a minority ownership position in Blade Dynamics Ltd. (“Blade Dynamics”), a designer and manufacturer of advanced wind turbine blades based on proprietary materials and structural technologies. The Company’s original investment was for $8.0 million in cash. As of March 31, 2014, the Company holds a 19% ownership interest in Blade Dynamics.

The investment is carried at the acquisition cost, plus the Company’s equity in undistributed earnings or losses, through December 1, 2012, the date which the company no longer reports undistributed earnings or losses. The Company’s investment in Blade Dynamics is included in other assets on the consolidated balance sheet and the equity in undistributed losses of Blade Dynamics is included in other income, net, on the unaudited condensed consolidated statements of operations.

During the year ended March 31, 2014, the Company determined that as a result of its efforts to sell its investment in Blade Dynamics, certain indicators of impairment existed which required the Company to perform further analysis. As a result of this analysis, the Company recorded an impairment charge of approximately $1.3 million.

The net investment activity for the year ended March 31, 2014 is as follows (in thousands):

Balance at April 1, 2013	$	4,611
Net foreign exchange rate impact		344
Impairment		(1,265	)
Balance at March 31, 2014	$	3,690

- Definition

The entire disclosure for equity method investments and joint ventures. Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee. Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group.

+ References+ Details

Restructuring and Impairments

12 Months Ended

Mar. 31, 2014

Restructuring and Impairments

16. Restructuring and Impairments

Restructuring

The Company accounts for charges resulting from operational restructuring actions in accordance with ASC Topic 420, Exit or Disposal Cost Obligations (“ASC 420”) and ASC Topic 712, Compensation — Nonretirement Postemployment Benefits (“ASC 712”). In accounting for these obligations, the Company is required to make assumptions related to the amounts of employee severance, benefits, and related costs and the time period over which leased facilities will remain vacant, sublease terms, sublease rates and discount rates. Estimates and assumptions are based on the best information available at the time the obligation arises. These estimates are reviewed and revised as facts and circumstances dictate; changes in these estimates could have a material effect on the amount accrued on the consolidated balance sheet.

During the years ended March 31, 2014, 2013 and 2012, the Company initiated restructuring activities, approved by the Board of Directors, in order to reorganize global operations, streamline various functions of the business, and reduce its global workforce to better reflect the demand for its products. Most recently, during the year ended March 31, 2014, the Company undertook a plan to consolidate its Grid manufacturing activities in its Devens, Massachusetts facility and close its facility in Middleton, Wisconsin. In addition, the Company is establishing a new Wind manufacturing facility in Romania and as a result reduced the headcount in its operation in China to a level necessary to support demand from its Chinese customers. From April 1, 2011 through March 31, 2014, the Company has reduced its global workforce by approximately 68% and as a result, the Company incurred costs associated with the workforce reduction consisting of severance pay, outplacement services, medical benefits, and other related benefits. For the years ended March 31, 2014, 2013, and 2012, the Company recorded employee severance and benefit costs of $1.7 million, $2.5 million, and $5.3 million, respectively. Remaining unpaid charges are expected to be paid through December 2014. In addition, during the year ended March 31, 2013, the Company consolidated certain of its business operations to reduce overall facility costs. The Beijing and Klagenfurt office consolidations were accounted for in accordance with ASC 420. The consolidation plan entailed vacating approximately 8,200 square feet of occupied space in Beijing China, and approximately 4,000 square feet of occupied space in Klagenfurt, Austria. The Company recorded a liability of $0.4 million as of March 31, 2013, associated with the fair value of the remaining lease payments as of the cease-use date and related office furniture and equipment. Fair value was determined based upon the discounted present value of remaining lease rentals for the space no longer occupied, considering future estimated potential sublease income.

The following table presents restructuring charges and cash payments (in thousands):

	Severance pay			Facility
	and benefits			exit costs			Total
Accrued restructuring balance at April 1, 2012	$	680		$	294		$	974
Charges to operations		2,501			436			2,937
Cash payments		(3,036	)		(676	)		(3,712	)
Accrued restructuring balance at March 31, 2013	$	145		$	54		$	199
Charges to operations		1,710			23			1,733
Cash payments		(836	)		(37	)		(873	)
Non-cash/miscellaneous reductions		(175	)		(39	)		(215	)
Accrued restructuring balance at March 31, 2014	$	844		$	0		$	844

In addition, during the year ended March 31, 2012, the Company also consolidated certain of its business operations to reduce overall facility costs. The consolidation plan entailed vacating approximately 8,937 square feet of occupied space in Klagenfurt, Austria, approximately 33,000 square feet of unoccupied space in Middleton, WI and approximately 3,300 square feet of occupied space in Nuremburg, Germany. The facility closures were accounted for in accordance with ASC 420. With respect to the Klagenfurt location, the Company recorded a liability equal to the fair value of the remaining lease payments as of the cease-use date. Fair value was determined based upon the discounted present value of remaining lease rentals for the space no longer occupied, considering future estimated potential sublease income. With respect to the Middleton location the Company settled with its landlord a final lease payment. As a result, the Company recorded facility exit costs of $0.3 million related to the remaining lease commitments on the leased space in Klagenfurt and Middleton locations. These charges were paid through March 2013. All restructuring charges discussed above are included within restructuring and impairments in the Company’s consolidated statements of operations. The Company includes accrued restructuring within accounts payable and accrued expenses in the consolidated balance sheets.

Impairments

The Company periodically evaluates its long-lived assets consisting principally of fixed assets and amortizable intangible assets for potential impairment. In accordance with the applicable accounting guidance for the treatment of long-lived assets, the Company reviews the carrying value of its long-lived assets or asset group that is held and used, including intangible assets subject to amortization, for impairment whenever events and circumstances indicate that the carrying value of the assets may not be recoverable. Under the held and used approach, the asset or asset group to be tested for impairment should represent the lowest level for which identifiable cash flows are largely independent of the cash flows of other groups of assets and liabilities. The Company evaluates its long-lived assets whenever events or circumstances suggest that the carrying amount of an asset or group of assets may not be recoverable from the estimated undiscounted future cash flows.

In fiscal 2013, 2012 and 2011, in response to challenging liquidity and market conditions, the Company entered into and completed certain restructuring activities, approved by the Board of Directors, in order to reduce costs and align its strategic priorities. Since the restructuring action impacted all of its operations, management concluded that there were indicators of potential impairment of its long-lived assets in each of those fiscal years and it therefore conducted assessments of the recoverability of these assets by comparing its carrying value of the assets to the pre-tax undiscounted cash flows estimated to be generated by those assets over their remaining book useful lives. Based on the calculations performed by management, the sum of the undiscounted cash flows forecasted to be generated by certain assets were less than the carrying value of those assets. Therefore, there were indications that certain of its assets were impaired and, as a result, the Company performed additional analysis. An evaluation of the level of impairment was made by comparing the implied fair value of those definite long-lived tangible and intangible assets of each reporting unit against their carrying values.

- Definition

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

+ References+ Details

Business Segment and Geographic Information

12 Months Ended

Mar. 31, 2014

Business Segment and Geographic Information

17. Business Segment and Geographic Information

The Company reports its financial results in two reportable business segments: Wind and Grid.

Through its Windtec Solutions, the Wind business segment enables manufacturers to field wind turbines with highly competitive power output, reliability and affordability. The Company supplies advanced power electronics and control systems, licenses its highly engineered wind turbine designs, and provides extensive customer support services to wind turbine manufactures. Its design portfolio includes a broad range of drive trains and power ratings of 2 MW’s and higher. It provides a broad range of power electronics and software-based control systems that are highly integrated and designed for optimized performance, efficiency, and grid compatibility.

Through its Gridtec Solutions, the Grid business segment enables electric utilities and renewable energy project developers to connect, transmit and distribute power with highly competitive efficiency, reliability and affordability. The Company provides transmission planning services that allow it to identify power grid congestion, poor power quality and other risks, which help the Company determine how its solutions can improve network performance. These services often lead to sales of grid interconnection solutions for wind farms and solar power plants, power quality systems and transmission and distribution cable systems.

The operating results for the two business segments are as follows (in thousands):

	For the Years Ended March 31,
	2014		2013		2012
Revenues:
Wind	$	55,608	$	44,231	$	44,642
Grid		28,509		43,188		31,901
Total	$	84,117	$	87,419	$	76,543

	2014			2013			2012
Operating loss:
Wind	$	(5,213	)	$	(16,098	)	$	(62,217	)
Grid		(22,523	)		(23,815	)		(29,645	)
Unallocated corporate expenses		(13,693	)		(17,828	)		(44,577	)
Total	$	(41,429	)	$	(57,741	)	$	(136,439	)

Total business segments assets are as follows (in thousands):

	March 31,		March 31,
	2014		2013
Wind	$	36,701	$	67,111
Grid		54,342		72,800
Corporate assets		77,466		76,843
Total	$	168,509	$	216,754

The accounting policies of the business segments are the same as those for the consolidated Company. The Company’s business segments have been determined in accordance with the Company’s internal management structure, which is organized based on operating activities. The Company evaluates performance based upon several factors, of which the primary financial measures are segment revenues and segment operating (loss) income. The disaggregated financial results of the segments reflect allocation of certain functional expense categories consistent with the basis and manner in which Company management internally disaggregates financial information for the purpose of assisting in making internal operating decisions. In addition, certain corporate expenses which the Company does not believe are specifically attributable or allocable to either of the two business segments have been excluded from the segment operating income.

Unallocated corporate expenses primarily consist of stock-based compensation expense of $10.7 million and $8.1 million, and $9.9 million for the years ended March 31, 2014, 2013 and 2012, respectively, and restructuring and impairment charges of $3.0 million, $7.9 million, and $9.2 million for the years ended March 31, 2014, 2013, and 2012, respectively. For the year ended March 31, 2013, unallocated corporate expenses also included a loss contingency of $1.8 million, also for the year ended March 31, 2012, unallocated corporate expenses included $20.6 million for the write-off of an advanced payment to The Switch.

Geographic information about revenue, based on shipments to customers by region, is as follows (in thousands):

	For the Years Ended March 31,
	2014		2013		2012
U.S.	$	11,013	$	13,197	$	21,347
Canada		3,312		1,663		1,219
Europe		7,453		14,709		2,868
China		24,748		17,906		16,929
Korea		6,429		10,945		12,486
India		26,384		17,062		14,212
Australia		4,779		11,937		7,482
Total	$	84,117	$	87,419	$	76,543

In the year ended March 31, 2014, 2013 and 2012, 87%, 85%, and 72% of the Company’s revenues, respectively, were recognized from sales outside the United States. The Company maintains operations in Austria, China and the United States and sales and service support centers around the world.

In the year ended March 31, 2014, two customers, Inox Wind Limited (“Inox”) and Beijing JINGCHENG New Energy (“JCNE”), accounted for approximately 31% and 18%, respectively, of the Company’s total revenues. In the year ended March 31, 2013, Inox and JCNE, accounted for approximately 19% and 13%, respectively, of the Company’s total revenues. In the year ended March 31, 2012, Inox and Doosan Heavy Industries, accounted for approximately 18% and 11%, respectively, of the Company’s total revenues.

Geographic information about property, plant and equipment associated with particular regions is as follows (in thousands):

	March 31,
	2014		2013
North America	$	62,426	$	71,127
Europe		1,232		1,941
Asia Pacific		916		1,558
Total	$	64,574	$	74,626

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8380-108599

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

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+ Details

Quarterly Financial Data

12 Months Ended

Mar. 31, 2014

Quarterly Financial Data

18. Quarterly Financial Data (Unaudited)

(In thousands, except per share amount)	For the year ended March 31, 2014:
Three Months Ended	June 30,			September 30,			December 31,			March 31,
	2013			2013			2013			2014
Total revenue	$	23,086		$	24,181		$	20,563		$	16,287
Operating loss		(8,850	)		(11,028	)		(6,675	)		(14,876	)
Net loss		(10,513	)		(14,623	)		(8,417	)		(22,705	)
Net loss per common share—basic		(0.18	)		(0.24	)		(0.14	)		(0.33	)
Net loss per common share—diluted		(0.18	)		(0.24	)		(0.14	)		(0.33	)

(In thousands, except per share amount)	For the year ended March 31, 2013:
Three Months Ended	June 30,			September 30,			December 31,			March 31,
	2012			2012			2012			2013
Total revenue	$	28,716		$	20,867		$	17,417		$	20,419
Operating loss		(6,128	)		(14,970	)		(20,616	)		(16,027	)
Net loss		(10,275	)		(15,949	)		(20,135	)		(19,773	)
Net loss per common share—basic		(0.20	)		(0.31	)		(0.38	)		(0.35	)
Net loss per common share—diluted		(0.20	)		(0.31	)		(0.38	)		(0.35	)

- Definition

The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished.

+ References+ Details

Recent Accounting Pronouncements

12 Months Ended

Mar. 31, 2014

Recent Accounting Pronouncements

20. Recent Accounting Pronouncements

In January 2013, the FASB issued Accounting Standards Update No. 2013-01, Balance Sheet (Topic 210): Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities (ASU 2013-01). The main objective in developing this update is to address implementation issues about the scope of Accounting Standards Update No. 2011-11, Balance Sheet (Topic 210): Disclosures about Offsetting Assets and Liabilities. The update requires entities to disclose information about offsetting and related arrangements of financial instruments and derivative instruments. ASU 2013-01 is effective for the Company’s first quarter of fiscal 2014. The Company is currently evaluating the impact of adopting ASU 2013-01, and does not believe there will be a significant impact on its consolidated results of operations, financial condition, or cash flows.

In March 2013, the FASB issued Accounting Standards Update No. 2013-05, Foreign Currency Matters (Topic 830): Parent’s Accounting for the Cumulative Translation Adjustment upon Derecognition of Certain Subsidiaries or Groups of Assets within a Foreign Entity or of an Investment in a Foreign Entity (ASU 2013-05). The objective of the amendments in this update is to resolve the diversity in practice about whether Subtopic 810-10, Consolidation — Overall, or Subtopic 830-30, Foreign Currency Matters — Translation of Financial Statements, applies to the release of the cumulative translation adjustment into net income when a parent either sells a part or all of its investment in a foreign entity or no longer holds a controlling financial interest in a subsidiary or group of assets that is a nonprofit activity or a business (other than a sale of in substance real estate or conveyance of oil and gas mineral rights) within a foreign entity. In addition, the amendments in this update resolve the diversity in practice for the treatment of business combinations achieved in involving a foreign entity. ASU 2013-05 is effective for fiscal years and interim periods beginning after December 15, 2013. The Company adopted ASU 2013-05 in the fourth quarter of fiscal 2013, and there were no significant effects on its consolidated results of operations, financial condition, or cash flows.

In June 2013, the FASB issued ASU 2013-07, Liquidation Basis of Accounting, to require entities to begin preparing financial statements on a liquidation basis when liquidation is imminent. The guidance requires liquidation accounting when liquidation is imminent, unless an entity is outside the scope of the guidance or it is following a liquidation plan established at its inception. The guidance says liquidation is imminent when either, the party or parties with the authority to approve a liquidation plan do so or other forces (e.g., involuntary bankruptcy) impose a plan for liquidation, and the likelihood that the entity will return from liquidation is remote. The guidance also requires entities using the liquidation basis of accounting to measure their assets at the amount they expect to collect upon sale and liabilities are not remeasured to reflect any anticipation that the entity will be legally released from the obligation. ASU 2013-07 is effective for annual periods beginning after December 15, 2013. The Company is currently evaluating the impact of adopting ASU 2013-07, but currently does not believe there will be an impact on its consolidated results of operations, financial condition, or cash flows.

In September 2013, the FASB issued ASU 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. The guidance states that an unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, except as follows. To the extent a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. This ASU applies to all entities that have unrecognized tax benefits when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists at the reporting date. The amendments in this ASU are effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. The Company is currently evaluating the impact of adopting ASU 2013-11, but currently does not believe there will be an impact on its consolidated results of operations, financial condition, or cash flow.

In May 2014, the FASB and the International Accounting Standards Board (IASB) issued, ASU Revenue from Contracts with Customers 2014-09 (Topic 606)., The guidance substantially converges final standards on revenue recognition between the FASB and IASB providing a framework on addressing revenue recognition issues and, upon its effective date, replaces almost all exiting revenue recognition guidance, including industry-specific guidance, in current U.S. generally accepted accounting principles. The ASU is effective for annual reporting periods beginning after December 15, 2016. The Company is currently evaluating the impact of adopting ASU 2014-09 to determine the impact, if any, it may have on its current practices.

The Company does not believe that other recently issued accounting pronouncements will have a material impact on its financial statements.

- Definition

The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 01

-Paragraph b

-Subparagraph 6

-Article 10

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 270

-SubTopic 10

-Section 45

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e765-108305

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-Name Accounting Standards Codification

-Glossary Direct Effects of a Change in Accounting Principle

-URI http://asc.fasb.org/extlink&oid=6510796

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-Name Accounting Standards Codification

-Glossary Indirect Effects of a Change in Accounting Principle

-URI http://asc.fasb.org/extlink&oid=6515603

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-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6503790

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-Name Accounting Standards Codification

-Glossary Change in Accounting Principle

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-Topic 270

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-Subparagraph (SX 210.10-01.(b)(6))

-URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699

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-Name Accounting Standards Codification

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-Topic 250

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-URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22583-107794

+ Details

Valuation and Qualifying Accounts

12 Months Ended

Mar. 31, 2014

Valuation and Qualifying Accounts

American Superconductor Corporation

Schedule II — Valuation and Qualifying Accounts

(In thousands)

	Balance,							Recoveries			Balance,
	Beginning of							and Other			End of
	Year		Additions		Write-offs			Adjustments			Year

Allowance for doubtful accounts receivable:
Fiscal year ended March 31, 2014	$	-		16		-			-		$	16
Fiscal year ended March 31, 2013	$	52		-		(52	)		-		$	-
Fiscal year ended March 31, 2012	$	683		6		(631	)		(6	)	$	52

	Balance,							Recoveries			Balance,
	Beginning of							and Other			End of
	Year		Additions		Write-offs			Adjustments			Year

Deferred tax asset valuation allowance:
Fiscal year ended March 31, 2014	$	261,961		26,649		(5,786	)	-			$	282,824
Fiscal year ended March 31, 2013	$	252,302		21,333		(11,674	)	-			$	261,961
Fiscal year ended March 31, 2012	$	220,596		41,709		(10,003	)		-		$	252,302

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Mar. 31, 2014

Basis of Consolidation

Property, Plant and Equipment

Asset Classification		Estimated Useful Life in Years
Building		40
Process upgrades to the building		10-40
Machinery and equipment		3-10
Furniture and fixtures		3-5
Leasehold improvements		Shorter of the estimated useful life or the remaining lease term

Valuation of Long-Lived Assets

Equity Method Investments

Revenue Recognition

The Company has elected to record taxes collected from customers on a net basis and does not include tax amounts in revenue or costs of revenue.

Product Warranty

Research and Development Costs

Research and development costs are expensed as incurred.

Income Taxes

Stock-Based Compensation

The Company accounts for stock-based payment transactions using a fair value-based method and recognizes the related expense in the results of operations.

Computation of Net Loss Per Common Share

Computation of Net Loss per Common Share

	Year ended March 31,
	2014			2013			2012

Numerator:
Net loss	$	(56,258	)	$	(66,131	)	$	(136,827	)
Denominator:
Weighted-average shares of common stock outstanding		64,111			53,537			51,144
Weighted-average shares subject to repurchase		(1,489	)		(467	)		(302	)
Shares used in per-share calculation ― basic		62,622			53,070			50,842
Shares used in per-share calculation ― diluted		62,622			53,070			50,842
Net loss per share ― basic	$	(0.90	)	$	(1.25	)	$	(2.69	)
Net loss per share ― diluted	$	(0.90	)	$	(1.25	)	$	(2.69	)

Foreign Currency Translation

Risks and Uncertainties

Contingencies

Debt

Disclosure of Fair Value of Financial Instruments

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Mar. 31, 2014

Estimated Useful Life of Property, Plant and Equipment

Asset Classification		Estimated Useful Life in Years
Building		40
Process upgrades to the building		10-40
Machinery and equipment		3-10
Furniture and fixtures		3-5
Leasehold improvements		Shorter of the estimated useful life or the remaining lease term

Reconciliation of Numerators and Denominators of EPS Calculation

	Year ended March 31,
	2014			2013			2012

Numerator:
Net loss	$	(56,258	)	$	(66,131	)	$	(136,827	)
Denominator:
Weighted-average shares of common stock outstanding		64,111			53,537			51,144
Weighted-average shares subject to repurchase		(1,489	)		(467	)		(302	)
Shares used in per-share calculation ― basic		62,622			53,070			50,842
Shares used in per-share calculation ― diluted		62,622			53,070			50,842
Net loss per share ― basic	$	(0.90	)	$	(1.25	)	$	(2.69	)
Net loss per share ― diluted	$	(0.90	)	$	(1.25	)	$	(2.69	)

Fair Value Disclosures (Tables)

12 Months Ended

Mar. 31, 2014

Schedule of Assets and Liabilities Carried at Fair Value

The following table provides the assets and liabilities carried at fair value, measured as of March 31, 2014 and 2013 (in thousands):

	Total		Quoted Prices in		Significant Other		Significant
	Carrying		Active Markets		Observable Inputs		Unobservable Inputs
	Value		(Level 1)		(Level 2)		(Level 3)
March 31, 2014:
Assets:
Cash equivalents	$	17,675	$	17,675	$	-	$	-
Derivative liabilities:
Warrants	$	2,601	$	-	$	-	$	2,601

	Total		Quoted Prices in		Significant Other		Significant
	Carrying		Active Markets		Observable Inputs		Unobservable Inputs
	Value		(Level 1)		(Level 2)		(Level 3)
March 31, 2013:
Assets:
Cash equivalents	$	18,649	$	18,649	$	-	$	-
Derivative liabilities:
Derivative liability	$	529	$	-	$	-	$	529
Warrants	$	3,633	$	-	$	-	$	3,633

Schedule of Liabilities Measured at Fair Value

The table below reflects the activity for the Company’s major classes of liabilities measured at fair value for the years ended March 31, 2014 and 2013 (in thousands):

	Derivative
	Liability			Warrants
April 1, 2013	$	529		$	3,633
Warrant issuance with Senior Secured Term Loan		-			315
Mark to market adjustment		(525	)		(1,347	)
Extinguishment of derivative liability		(4	)		-
Balance at March 31, 2014	$	-		$	2,601

	Derivative
	Liability			Warrants
April 1, 2012	$	-		$	-
Valuation of original derivative liability		3,779			-
Warrant issuance with Senior Convertible Note		-			7,018
Warrant issuance with Senior Secured Term Loan		-			380
Valuation of derivative liability attributable to modification		542			-
Mark to market adjustment		(3,792	)		(3,765	)
Balance at March 31, 2013	$	529		$	3,633

Schedule of Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis

The following table provides the assets and liabilities measured at fair value on a non-recurring basis, as of March 31, 2014 (in thousands):

	Total		Quoted Prices in	Significant Other	Significant
	Carrying		Active Markets	Observable Inputs	Unobservable Inputs
	Value		(Level 1)	(Level 2)	(Level 3)
March 31, 2014:
Assets:
Investment in unconsolidated entity – Blade Dynamics	$	3,690	$	$	$	3,690

Accounts Receivable (Tables)

12 Months Ended

Mar. 31, 2014

Schedule of Accounts Receivable

Accounts receivable at March 31, 2014 and 2013 consisted of the following (in thousands):

	March 31,			March 31,
	2014			2013
Accounts receivable (billed)	$	6,113		$	17,222
Accounts receivable (unbilled)		1,459			1,642
Less: Allowance for doubtful accounts		(16	)		-
Accounts receivable, net	$	7,556		$	18,864

Inventory (Tables)

12 Months Ended

Mar. 31, 2014

Schedule of Inventory

Inventory at March 31, 2014 and 2013 consisted of the following (in thousands):

	March 31,		March 31,
	2014		2013
Raw materials	$	3,304	$	5,966
Work-in-process		4,047		3,427
Finished goods		10,275		21,655
Deferred program costs		3,068		2,425
Net inventory	$	20,694	$	33,473

Property, Plant and Equipment (Tables)

12 Months Ended

Mar. 31, 2014

Schedule of Cost and Accumulated Depreciation of Property and Equipment

The cost and accumulated depreciation of property and equipment at March 31, 2014 and 2013 are as follows (in thousands):

	March 31,
	2014			2013
Land	$	3,643		$	3,643
Construction in progress - equipment		117			14,505
Buildings		34,341			34,398
Equipment and software		83,861			71,116
Furniture and fixtures		1,353			1,626
Leasehold improvements		5,211			5,556
Property, plant and equipment, gross		128,526			130,844
Less accumulated depreciation		(63,952	)		(56,218	)
Property, plant and equipment, net	$	64,574		$	74,626

Intangible Assets (Tables)

12 Months Ended

Mar. 31, 2014

Schedule of Intangible Assets

Intangible assets at March 31, 2014 and 2013 consisted of the following (in thousands):

	2014							2013
	Gross		Accumulated			Net Book		Gross		Accumulated			Net Book		Estimated
	Amount		Amortization			Value		Amount		Amortization			Value		Useful Life
Licenses	$	4,473	$	(2,962	)	$	1,511	$	5,349	$	(3,366	)	$	1,983	7
Trade names and trademarks		1,250		(1,250	)		-		1,165		(1,040	)		125	7
Core technology and know-how		5,736		(5,252	)		484		5,453		(4,812	)		641	5-10
Intangible assets	$	11,459	$	(9,464	)	$	1,995	$	11,967	$	(9,218	)	$	2,749

Schedule of Expected Future Amortization Expense

Expected future amortization expense related to intangible assets is as follows (in thousands):

For the years ended March 31,	Total
2015	$	573
2016		568
2017		553
2018		301
Total	$	1,995

Schedule of Geographic Composition of Goodwill and Intangible Assets

The geographic composition of intangible assets is as follows (in thousands):

	March 31,
	2014		2013
Intangible assets by geography:
U.S.	$	1,995	$	2,624
Europe		-		125
Total	$	1,995	$	2,749

Schedule of Business Segment Composition of Intangible Assets

The business segment composition of intangible assets is as follows (in thousands):

	March 31,
	2014		2013
Intangible assets by business segments:
Wind	$	-	$	152
Grid		1,995		2,597
Total	$	1,995	$	2,749

Accounts Payable and Accrued Expenses (Tables)

12 Months Ended

Mar. 31, 2014

Schedule of Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses consisted of the following (in thousands):

	March 31,
	2014		2013
Accounts payable	$	1,749	$	7,146
Accrued inventories in-transit		212		779
Accrued miscellaneous expenses		6,076		9,172
Accrued outside services		3,716		2,251
Accrued subcontractor program costs		290		2,442
Accrued compensation		5,939		5,506
Income taxes payable		173		133
Accrued adverse purchase commitments		402		1,440
Accrued warranty		3,207		2,709
Total	$	21,764	$	31,578

Schedule of Product Warranty Activity

	For the years ended
	March 31,
	2014			2013
Balance at beginning of period	$	2,709		$	5,896
Change in accruals for warranties during the period		1,717			1,371
Settlements during the period		(1,219	)		(4,558	)
Balance at end of period	$	3,207		$	2,709

Warrants and Derivative Liabilities (Tables)

12 Months Ended

Mar. 31, 2014

Schedule of Fair Value Assumptions Used to Calculate Value of Convertible Note Derivative Feature

Following is a summary of the key assumptions used to value the convertible notes derivative feature:

	March 31,			December 31,			September 30,			June 30,
Fiscal Year 13	2014			2013			2013			2013

Principal outstanding (000's)	$ —			$	10,411		$	10,411		$	14,389
Stock price	N/A			$	1.64		$	2.34		$	2.64
Percentage volume condition met	— %				87.2	%		80.2	%		87.5	%
Expected volatility	— %				68.6	%		66.3	%		65.8	%
Risk free rate	— %				0.12	%		0.10	%		0.21	%
Bond yield	— %				16.5	%		15.5	%		16.7	%
Recovery rate	— %				35.0	%		35.0	%		37.0	%
Redeemable	N/A			yes			yes			yes
Total time (years)	—				0.75			1.00			1.26
Dilution effect	N/A			yes			yes			yes
Fair value	$ —			$ —			$ 0.2 million			$ 0.5 million
Fair value as a percent of par					0.02	%		0.7	%		3.3	%


							Post-modification			Pre-modification
	March 31,			December 31,			December 20,			December 20,			September 30,			June 30,			April 4,
Fiscal Year 12	2013			2012			2012			2012			2012			2012			2012

Principal outstanding (000's)	$	15,380		$	20,944		$	20,944		$	24,074		$	24,074		$	25,000		$	25,000
Stock price	$	2.67		$	2.62		$	2.95		$	2.95		$	4.15		$	4.68		$	3.97
Percentage volume condition met		80.5	%		94.5	%		94.9	%		28.6	%		51.0	%		75.2	%		85.9	%
Expected volatility		66.9	%		73.5	%		72.5	%		72.5	%		70.0	%		71.0	%		75.0	%
Risk free rate		0.20	%		0.23	%		0.25	%		0.25	%		0.23	%		0.33	%		0.44	%
Bond yield		16.5	%		16.5	%		16.5	%		16.5	%		15.0	%		16.0	%		15.0	%
Recovery rate		30.0	%		30.0	%		30.0	%		30.0	%		30.0	%		30.0	%		30.0	%
Redeemable	yes			yes			yes			yes			yes			yes			yes
Total time (years)		1.51			1.76			1.79			1.79			2.01			2.28			2.50
Dilution effect	yes			yes			yes			yes			yes			yes			yes
Fair value	$ 0.5 million			$ 1.0 million			$ 1.5 million			$ 0.9 million			$ 2.8 million			$ 4.5 million			$ 3.8 million
Fair value as a percent of par		3.4	%		4.9	%		7.1	%		3.9	%		11.4	%		17.9	%		15.1	%

Securities Purchase Agreement

Schedule of Assumptions Used to Calculate the Fair Value of Warrants

Following is a summary of the key assumptions used to calculate the fair value of the warrant:

							Post-modification			Pre-modification
	March 31,			December 31,			October 9,			October 9,			September 30,			June 30,
Fiscal Year 13	2014			2013			2013			2013			2013			2013

Risk-free interest rate		1.11	%		1.17	%		1.05	%		1.05	%		1.02	%		1.13	%
Expected annual dividend yield		—	%		—	%		—	%		—	%		—	%		—	%
Expected volatility		81.0	%		75.6	%		71.5	%		71.5	%		72.0	%		71.9	%
Term (years)	3.51			3.76			3.99			3.99				4.01			4.27
Fair value	$ 2.2 million			$ 2.2 million			$ 3.2 million			$ 2.2 million			$ 2.5 million			$ 3.0 million

	March 31,			December 31,			September 30,			June 30,			April 4,
Fiscal Year 12	2013			2012			2012			2012			2012

Risk-free interest rate		0.67	%		0.75	%		0.63	%		0.77	%		1.19	%
Expected annual dividend yield		—	%		—	%		—	%		—	%		—	%
Expected volatility		71.7	%		80.6	%		80.9	%		80.8	%		80.0	%
Term (years)		4.51			4.76			5.01			5.28			5.50
Fair value	$ 3.4 million			$ 4.4 million			$ 7.1 million			$ 8.6 million			$ 7.0 million

Loan and Security Agreement

Schedule of Assumptions Used to Calculate the Fair Value of Warrants

Following is a summary of the key assumptions used to calculate the fair value of the warrant:

							Post-modification			Pre-modification
	March 31,			December 31,			November 15,			November 15,			September 30,			June 30,
Fiscal Year 13	2014			2013			2013			2013			2013			2013

Risk-free interest rate		1.18	%		1.24	%		1.00	%		1.00	%		1.09	%		1.20	%
Expected annual dividend yield		—	%		—	%		—	%		—	%		—	%		—	%
Expected volatility		80.73	%		74.79	%		72.64	%		72.64	%		72.10	%		72.30	%
Term (years)		3.68			3.93			4.05			4.05			4.18			4.43
Fair value	$ 0.1 million			$ 0.1 million			$ 0.1 million			$ 0.1 million			$ 0.2 million			$ 0.2 million



	March 31,			December 31,			September 30,			June 30,			June 5,
Fiscal Year 12	2013			2012			2012			2012			2012

Risk-free interest rate		0.70	%		0.75	%		0.64	%		0.80	%		0.77	%
Expected annual dividend yield		—	%		—	%		—	%		—	%		—	%
Expected volatility		72.01	%		80.14	%		81.18	%		80.32	%		79.99	%
Term (years)		4.68			4.93			5.18			5.44			5.50
Fair value	$ 0.2 million			$ 0.2 million			$ 0.4 million			$ 0.5 million			$ 0.4 million

Senior Secured Term Loan – Second Warrant

Schedule of Assumptions Used to Calculate the Fair Value of Warrants

Following is a summary of the key assumptions used to calculate the fair value of the Second Warrant:

							New Issuance
	March 31,			December 31,			November 15,
Fiscal Year 13	2014			2013			2013

Risk-free interest rate		1.76	%		1.89	%		1.55	%
Expected annual dividend yield		—	%		—	%		—	%
Expected volatility		79.73	%		80.37	%		76.97	%
Term (years)		5.12			5.37			5.49
Fair value	$ 0.3 million			$ 0.3 million			$ 0.3 million

- Definition

Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.

+ References+ Details

- Definition

Tabular disclosure of the application of the fair value option for measurement and reporting of eligible financial assets and liabilities (as defined), as well as certain other eligible items (as defined) included in the statement of financial position, whether such option is elected for a single eligible item or a group of similar eligible items and is in addition to other disclosures concerning fair value which the company may be required to provide. Such disclosure might be expected to include: (1) for items included in the statement of financial position: (a) for each line item in the statement of financial position that includes an item or items for which the fair value option has been elected, provide the aggregate carrying amount of ineligible items included in each line item in the balance sheet, if any; (b) the difference between the aggregate fair value and the aggregate unpaid principal balance (assuming contractual principal amounts and fair value option elected) of: (i) loans and long-term receivables (other than securities otherwise reported at fair value) and (ii) long-term debt instruments; (c) for loans held as assets for which the fair value option has been elected: (i) the aggregate fair value of loans that are 90 days or more past due, (ii) if the policy is to recognize interest income separately from other changes in fair value, the aggregate fair value of loans in nonaccrual status, and (iii) the difference between the aggregate fair value and the aggregate unpaid principal balance for loans that are 90 days or more past due, in nonaccrual status, or both; (2) for items included in the income statement: (a) the amounts of gains and losses from fair value changes included in earnings and in which line in the income statement those gains and losses are reported whether or not combined with gains and losses from items required to be accounted for at fair value; (b) for loans and other receivables held as assets, the estimated amount of gains or losses included in earnings attributable to changes in instrument-specific credit risk; (c) for liabilities with fair values that have been significantly affected during the reporting period by changes in the instrument-specific credit risk, the estimated amount of gains and losses from fair value changes included in earnings that are attributable to changes in the instrument-specific credit risk; and (3) certain other disclosures as required or determined to be provided.

+ References+ Details

Income Taxes (Tables)

12 Months Ended

Mar. 31, 2014

Schedule of Income (Loss) Before Income Taxes

Income (loss) before income taxes for the years ended March 31, 2014, 2013, and 2012 are provided in the table as follows (in thousands):

	For the years ended March 31,
	2014			2013			2012
Income (loss) before income tax expense:
U.S.	$	(91,558	)	$	(66,975	)	$	(107,301	)
Foreign		36,152			580			(28,157	)
Total	$	(55,406	)	$	(66,395	)	$	(135,458	)

Schedule of Components of Income Tax Expense (Benefit) Attributable to Continuing Operations

The components of income tax expense (benefit) attributable to continuing operations consist of the following (in thousands):

	For the years ended March 31,
	2014			2013			2012
Current
Federal	$	287		$	94		$	-
State		-			-			-
Foreign		614			(438	)		1,369
Total current		901			(344	)		1,369

Deferred
Federal		(49	)		93			-
State		-			-			-
Foreign		-			(13	)		-
Total deferred		(49	)		80			-

Income tax (benefit) expense	$	852		$	(264	)	$	1,369

Schedule of Reconciliation of Statutory Federal Income Tax Rate to Effective Income Tax Rate

The reconciliation between the statutory federal income tax rate and the Company’s effective income tax rate is shown below.

	For the years ended March 31,
	2014			2013			2012
Statutory federal income tax rate		(34	)%		(34	)%		(34	)%
State income taxes, net of federal benefit		-			(3	)		(2	)
Deemed dividend		1			2			3
Foreign income tax rate differential		(6	)		(2	)		3
Stock options		2			(2	)		1
Nondeductible expenses		1			1			-
Research and development tax credit		-			(1	)		(1	)
Deferred Warrants		(1)			-			-
Interest expense		5			7			-
Extinguishment of debt		3			-			-
Valuation allowance		30			32			31
Effective income tax rate		1	%		-	%		1	%

Schedule of Deferred Tax Assets and Liabilities

The following is a summary of the principal components of the Company’s deferred tax assets and liabilities (in thousands):

	For the years ended March 31,
	2014			2013
Deferred tax assets:
Net operating loss carryforwards	$	260,254		$	239,040
Research and development and other tax credit carryforwards		10,613			10,112
Accruals and reserves		36,214			35,490
Fixed assets and intangible assets		2,855			4,101
Other		19,594			18,292
Gross deferred tax assets		329,530			307,035
Valuation allowance		(282,824	)		(261,961	)
Total deferred tax assets		46,706			45,074

Deferred tax liabilities:
Intercompany debt		(36,102	)		(35,185	)
Other		(10,641	)		(9,979	)
Total deferred tax liabilities		(46,743	)		(45,164	)
Net deferred tax liabilities	$	(37	)	$	(90	)

Schedule of Uncertainties in Income Tax Provision Liability

A tabular roll-forward of the Company’s uncertainties in income tax provision liability is presented below (in thousands):

Balance at March 31, 2012	$	1,061
Increase for tax positions		-
Balance at March 31, 2013	$	1,061
Increase for tax positions		-
Balance at March 31, 2014	$	1,061

Stockholders' Equity (Tables)

12 Months Ended

Mar. 31, 2014

Components of Employee Stock-Based Compensation

The components of employee stock-based compensation for the years ended March 31, 2014, 2013 and 2012 were as follows (in thousands):

	For the Years Ended March 31,
	2014		2013		2012
Stock options	$	2,730	$	3,389	$	6,177
Restricted stock and stock awards		7,936		4,698		3,633
Employee stock purchase plan		30		51		54
Total stock-based compensation expense	$	10,696	$	8,138	$	9,864

Summary of Employee Stock-Based Compensation Expense by Financial Statement Line Item

The following table summarizes employee stock-based compensation expense by financial statement line item for the years ended March 31, 2014, 2013 and 2012 (in thousands):

	2014		2013		2012
Cost of revenues	$	1,002	$	726	$	1,121
Research and development		2,751		2,456		2,562
Selling, general and administrative		6,943		4,956		6,181
Total	$	10,696	$	8,138	$	9,864

Summary of Employee and Non-Employee Stock Options Activity

The following table summarizes the information concerning currently outstanding and exercisable employee and non-employee options:

						Weighted-
				Weighted-		Average
				Average		Remaining		Aggregate
	Options/			Exercise		Contractual		Intrinsic Value
	Shares			Price		Term		(thousands)
Outstanding at March 31, 2013		2,671,194		$	13.77
Granted at fair value		830,765			2.48
Exercised		-			-
Cancelled/forfeited		(560,121	)		11.93
Outstanding at March 31, 2014		2,941,838		$	10.93		6.7	$	-
Exercisable at March 31, 2014		1,484,288		$	15.22		5.0	$	-
Fully vested and expected to vest at March 31, 2014		2,836,755		$	11.15		6.6	$	-

Schedule of Weighted Average Assumptions Used in the Black-Scholes Valuation Model for Stock Options Granted

The weighted average assumptions used in the Black-Scholes valuation model for stock options granted during the years ended March 31, 2014, 2013, and 2012 are as follows:

	For the Years Ended March 31,
	2014			2013			2012
Expected volatility		75.1	%		72.0	%		70.0	%
Risk-free interest rate		1.7	%		0.9	%		1.8	%
Expected life (years)		5.9			5.9			5.9
Dividend yield	None			None			None

Summary of the Employee and Non-Employee Restricted Stock Activity

The following table summarizes the employee and non-employee restricted stock activity for the year ended March 31, 2014:

				Weighted		Intrinsic
				Average		Aggregate
				Grant Date		Value
	Shares			Fair Value		(thousands)
Outstanding at March 31, 2013		2,404,825		$	4.58
Granted		1,945,610			2.30
Vested		(1,740,959	)		3.91
Forfeited		(194,112	)		3.54
Outstanding at March 31, 2014		2,415,364		$	3.34	$	3,889

Commitments and Contingencies (Tables)

12 Months Ended

Mar. 31, 2014

Schedule of Minimum Future Lease Commitments

Minimum future lease commitments at March 31, 2014 were as follows (in thousands):

For the years ended March 31,	Total
2015	$	1,764
2016		1,166
2017		674
2018		423
2019		211
Thereafter		378
Total	$	4,616

Schedule of Rent Expense Under Operating Leases

Rent expense under the operating leases mentioned above was as follows (in thousands):

	For the years ended
	March 31,
	2014		2013		2012
Rent expense	$	2,152	$	2,437	$	3,336

Minority Investments (Tables)

12 Months Ended

Mar. 31, 2014

Schedule of Net Investment in Tres Amigas LLC

The net investment activity for the year ended March 31, 2014 is as follows (in thousands):

Balance at April 1, 2013	$	2,853
Minority interest in net losses		(1,008	)
Balance at March 31, 2014	$	1,845

Schedule of Net Investment in Blade Dynamics Ltd

The net investment activity for the year ended March 31, 2014 is as follows (in thousands):

Balance at April 1, 2013	$	4,611
Net foreign exchange rate impact		344
Impairment		(1,265	)
Balance at March 31, 2014	$	3,690

Restructuring and Impairments (Tables)

12 Months Ended

Mar. 31, 2014

Schedule of Restructuring Charges and Cash Payments

The following table presents restructuring charges and cash payments (in thousands):

	Severance pay			Facility
	and benefits			exit costs			Total
Accrued restructuring balance at April 1, 2012	$	680		$	294		$	974
Charges to operations		2,501			436			2,937
Cash payments		(3,036	)		(676	)		(3,712	)
Accrued restructuring balance at March 31, 2013	$	145		$	54		$	199
Charges to operations		1,710			23			1,733
Cash payments		(836	)		(37	)		(873	)
Non-cash/miscellaneous reductions		(175	)		(39	)		(215	)
Accrued restructuring balance at March 31, 2014	$	844		$	0		$	844

Business Segment and Geographic Information (Tables)

12 Months Ended

Mar. 31, 2014

Operating Results for Two Business Segments

The operating results for the two business segments are as follows (in thousands):

	For the Years Ended March 31,
	2014		2013		2012
Revenues:
Wind	$	55,608	$	44,231	$	44,642
Grid		28,509		43,188		31,901
Total	$	84,117	$	87,419	$	76,543

	2014			2013			2012
Operating loss:
Wind	$	(5,213	)	$	(16,098	)	$	(62,217	)
Grid		(22,523	)		(23,815	)		(29,645	)
Unallocated corporate expenses		(13,693	)		(17,828	)		(44,577	)
Total	$	(41,429	)	$	(57,741	)	$	(136,439	)

Total Business Segments Assets

Total business segments assets are as follows (in thousands):

	March 31,		March 31,
	2014		2013
Wind	$	36,701	$	67,111
Grid		54,342		72,800
Corporate assets		77,466		76,843
Total	$	168,509	$	216,754

Geographic Information about Revenue, Based on Shipments to Customers by Region

Geographic information about revenue, based on shipments to customers by region, is as follows (in thousands):

	For the Years Ended March 31,
	2014		2013		2012
U.S.	$	11,013	$	13,197	$	21,347
Canada		3,312		1,663		1,219
Europe		7,453		14,709		2,868
China		24,748		17,906		16,929
Korea		6,429		10,945		12,486
India		26,384		17,062		14,212
Australia		4,779		11,937		7,482
Total	$	84,117	$	87,419	$	76,543

Geographic Information about Property, Plant and Equipment Associated with Particular Regions

Geographic information about property, plant and equipment associated with particular regions is as follows (in thousands):

	March 31,
	2014		2013
North America	$	62,426	$	71,127
Europe		1,232		1,941
Asia Pacific		916		1,558
Total	$	64,574	$	74,626

Quarterly Financial Data (Tables)

12 Months Ended

Mar. 31, 2014

Schedule Of Quarterly Financial Data

(In thousands, except per share amount)	For the year ended March 31, 2014:
Three Months Ended	June 30,			September 30,			December 31,			March 31,
	2013			2013			2013			2014
Total revenue	$	23,086		$	24,181		$	20,563		$	16,287
Operating loss		(8,850	)		(11,028	)		(6,675	)		(14,876	)
Net loss		(10,513	)		(14,623	)		(8,417	)		(22,705	)
Net loss per common share—basic		(0.18	)		(0.24	)		(0.14	)		(0.33	)
Net loss per common share—diluted		(0.18	)		(0.24	)		(0.14	)		(0.33	)

(In thousands, except per share amount)	For the year ended March 31, 2013:
Three Months Ended	June 30,			September 30,			December 31,			March 31,
	2012			2012			2012			2013
Total revenue	$	28,716		$	20,867		$	17,417		$	20,419
Operating loss		(6,128	)		(14,970	)		(20,616	)		(16,027	)
Net loss		(10,275	)		(15,949	)		(20,135	)		(19,773	)
Net loss per common share—basic		(0.20	)		(0.31	)		(0.38	)		(0.35	)
Net loss per common share—diluted		(0.20	)		(0.31	)		(0.38	)		(0.35	)

Nature of the Business and Operations and Liquidity - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	12 Months Ended			36 Months Ended			1 Months Ended				3 Months Ended		12 Months Ended
	Mar. 31, 2014 Employees	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2014 Employees	Mar. 31, 2011	Mar. 31, 2014 ATM Arrangement	Mar. 02, 2014 Senior Convertible Debt	Apr. 04, 2012 Senior Convertible Debt	Jun. 05, 2012 Senior Secured Term Loan	Nov. 15, 2013 New Term Loan	Mar. 31, 2014 MLV & Co. LLC	Mar. 31, 2014 MLV & Co. LLC ATM Arrangement	Mar. 31, 2014 MLV & Co. LLC ATM Arrangement	Nov. 15, 2013 MLV & Co. LLC ATM Arrangement
Description Of Business [Line Items]
Accumulated deficit	$ (856,389,000)	$ (800,131,000)		$ (856,389,000)
Cash and cash equivalents	43,114,000	39,243,000	46,279,000	43,114,000	123,783,000
Net cash used in operating activities	(13,267,000)	(45,271,000)	(141,042,000)
Reduction in global workforce, percentage				68.00%
Number of workforce persons	269			269
Debt, face amount								25,000,000	10,000,000	10,000,000
Interest rate percentage								7.00%
Debt conversion, shares issued							6.6
Common stock	789,000	603,000		789,000										30,000,000
Net proceeds from sale of common stock											4,100,000	4,100,000	7,500,000
Sale of common stock												2.5	4.9
Average sale price of share												$ 1.74	$ 1.62
Availability of cash						$ 22,100,000

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Inventory reserve	$ 300,000	$ 300,000	$ 2,200,000
Benefit to cost of revenues		4,300,000	2,100,000	800,000
Impairment charge	1,300,000	1,265,000	5,000,000	1,700,000
Payments received from customers		3,700,000	3,400,000	5,200,000
Percentage of tax benefit likely to be realized upon ultimate settlement		50.00%
Repatriated amount		1,500,000
Federal and state deferred tax liability	7,761,000	7,761,000	5,444,000
Common equivalent shares not included in the calculation of diluted EPS		6,431,584	10,725,840	2,290,416
Net foreign currency transaction and hedging gains (losses)		(100,000)	1,000,000	3,100,000
Loss contingency accrual			1,800,000
Foriegn Earnings Repatriated
Federal and state deferred tax liability	500,000	500,000
Minimum
Warranty period		1 year
Maximum
Warranty period		3 years
Blade Dynamics Ltd
Impairment charge		$ 1,265,000
Inox Wind Limited
Risk percentage		31.00%	19.00%	18.00%
Inox Wind Limited \| Accounts Receivable
Risk percentage		20.00%	41.00%
CG Power Solutions UK Ltd \| Accounts Receivable
Risk percentage		14.00%	17.00%
Hyundai Heavy Industries Co Ltd \| Accounts Receivable
Risk percentage		13.00%	11.00%

Summary of Significant Accounting Policies - Estimated Useful Life of Property, Plant and Equipment (Detail)	12 Months Ended
	Mar. 31, 2014
Buildings
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful life in years	40 years
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful life in years, description	Shorter of the estimated useful life or the remaining lease term
Minimum \| Process Upgrades to the Building
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful life in years	10 years
Minimum \| Machinery and Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful life in years	3 years
Minimum \| Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful life in years	3 years
Maximum \| Process Upgrades to the Building
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful life in years	40 years
Maximum \| Machinery and Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful life in years	10 years
Maximum \| Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful life in years	5 years

Summary of Significant Accounting Policies - Reconciliation of Numerators and Denominators of EPS Calculation (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Accounting Policies [Abstract]
Net loss	$ (22,705)	$ (8,417)	$ (14,623)	$ (10,513)	$ (19,773)	$ (20,135)	$ (15,949)	$ (10,275)	$ (56,258)	$ (66,131)	$ (136,827)
Weighted-average shares of common stock outstanding									64,111	53,537	51,144
Weighted-average shares subject to repurchase									(1,489)	(467)	(302)
Shares used in per-share calculation basic									62,622	53,070	50,842
Shares used in per-share calculation diluted									62,622	53,070	50,842
Basic	$ (0.33)	$ (0.14)	$ (0.24)	$ (0.18)	$ (0.35)	$ (0.38)	$ (0.31)	$ (0.20)	$ (0.90)	$ (1.25)	$ (2.69)
Diluted	$ (0.33)	$ (0.14)	$ (0.24)	$ (0.18)	$ (0.35)	$ (0.38)	$ (0.31)	$ (0.20)	$ (0.90)	$ (1.25)	$ (2.69)

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Fair Value Disclosures - Schedule of Assets and Liabilities Carried at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Apr. 04, 2012
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	$ 17,675			$ 18,649
Warrants	2,601			3,633
Derivative liability		200	5,444	529	1,000	2,800	4,500	3,800
Quoted Prices in Active Markets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	17,675			18,649
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Warrants	2,601			3,633
Derivative liability				$ 529

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details

Fair Value Disclosures - Schedule of Liabilities Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Derivative Liability
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance		$ 529
Valuation of original derivative liability		3,779
Valuation of derivative liability attributable to modification		542
Mark to market adjustment	(525)	(3,792)
Extinguishment of derivative liability	(4)
Ending balance		529
Warrants
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance	2,601	3,633
Warrant issuance with Senior Convertible Note		7,018
Warrant issuance with Senior Secured Term Loan	315	380
Mark to market adjustment	(1,347)	(3,765)
Ending balance	$ 2,601	$ 3,633

Accounts Receivable - Schedule of Accounts Receivable (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Accounts Notes And Loans Receivable [Line Items]
Accounts receivable (billed)	$ 6,113	$ 17,222
Accounts receivable (unbilled)	1,459	1,642
Less: Allowance for doubtful accounts	(16)
Accounts receivable, net	$ 7,556	$ 18,864

Accounts Receivable - Additional Information (Detail)	12 Months Ended
Accounts Receivable - Additional Information (Detail)	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Inox Wind Limited
Accounts Notes And Loans Receivable [Line Items]
Risk percentage	31.00%	19.00%	18.00%
Accounts Receivable \| Inox Wind Limited
Accounts Notes And Loans Receivable [Line Items]
Risk percentage	20.00%	41.00%
Accounts Receivable \| CG Power Solutions UK Ltd
Accounts Notes And Loans Receivable [Line Items]
Risk percentage	14.00%	17.00%
Accounts Receivable \| Hyundai Heavy Industries Co Ltd
Accounts Notes And Loans Receivable [Line Items]
Risk percentage	13.00%	11.00%
Accounts Receivable \| JINGCHENG New Energy
Accounts Notes And Loans Receivable [Line Items]
Risk percentage	13.00%

Inventory - Schedule of Inventory (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Inventory [Line Items]
Raw materials	$ 3,304	$ 5,966
Work-in-process	4,047	3,427
Finished goods	10,275	21,655
Deferred program costs	3,068	2,425
Net inventory	$ 20,694	$ 33,473

Property, Plant and Equipment - Schedule of Cost and Accumulated Depreciation of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 128,526	$ 130,844
Less accumulated depreciation	(63,952)	(56,218)
Property, plant and equipment, net	64,574	74,626
Land
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	3,643	3,643
Construction In Progress-Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	117	14,505
Buildings
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	34,341	34,398
Equipment And Software
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	83,861	71,116
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	1,353	1,626
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 5,211	$ 5,556

Intangible Assets - Schedule of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Finite Lived Intangible Assets [Line Items]
Intangible assets, Gross Amount	$ 11,459	$ 11,967
Intangible assets, Accumulated Amortization	(9,464)	(9,218)
Intangible assets, Net Book Value	1,995	2,749
Licenses
Finite Lived Intangible Assets [Line Items]
Intangible assets, Gross Amount	4,473	5,349
Intangible assets, Accumulated Amortization	(2,962)	(3,366)
Intangible assets, Net Book Value	1,511	1,983
Intangible assets, Estimated Useful Life	7 years
Trade Names And Trademarks
Finite Lived Intangible Assets [Line Items]
Intangible assets, Gross Amount	1,250	1,165
Intangible assets, Accumulated Amortization	(1,250)	(1,040)
Intangible assets, Net Book Value		125
Intangible assets, Estimated Useful Life	7 years
Core Technology And Know How
Finite Lived Intangible Assets [Line Items]
Intangible assets, Gross Amount	5,736	5,453
Intangible assets, Accumulated Amortization	(5,252)	(4,812)
Intangible assets, Net Book Value	$ 484	$ 641
Core Technology And Know How \| Minimum
Finite Lived Intangible Assets [Line Items]
Intangible assets, Estimated Useful Life	5 years
Core Technology And Know How \| Maximum
Finite Lived Intangible Assets [Line Items]
Intangible assets, Estimated Useful Life	10 years

Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Finite Lived Intangible Assets [Line Items]
Intangible amortization expense	$ 800,000	$ 900,000	$ 2,600,000
Patent costs			$ 4,917,000

Intangible Assets - Schedule of Expected Future Amortization Expense (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Finite Lived Intangible Assets [Line Items]
2015	$ 573
2016	568
2017	553
2018	301
Total	$ 1,995	$ 2,749

Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Accounts payable	$ 1,749	$ 7,146
Accrued inventories in-transit	212	779
Accrued miscellaneous expenses	6,076	9,172
Accrued outside services	3,716	2,251
Accrued subcontractor program costs	290	2,442
Accrued compensation	5,939	5,506
Income taxes payable	173	133
Accrued adverse purchase commitments	402	1,440
Accrued warranty	3,207	2,709
Total	$ 21,764	$ 31,578

Accounts Payable and Accrued Expenses - Schedule of Product Warranty Activity (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Balance at beginning of period	$ 2,709	$ 5,896
Change in accruals for warranties during the period	1,717	1,371
Settlements during the period	(1,219)	(4,558)
Balance at end of period	$ 3,207	$ 2,709

Debt - Additional Information (Detail) (USD $)	12 Months Ended										1 Months Ended	3 Months Ended	1 Months Ended	12 Months Ended			1 Months Ended			12 Months Ended	1 Months Ended	12 Months Ended			1 Months Ended	3 Months Ended	12 Months Ended	1 Months Ended					12 Months Ended		1 Months Ended
Debt - Additional Information (Detail) (USD $)	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Apr. 04, 2012	Mar. 02, 2014 Capital Ventures International	Mar. 31, 2014 Capital Ventures International	Mar. 02, 2014 Senior Convertible Debt	Mar. 31, 2014 Senior Convertible Debt	Mar. 31, 2013 Senior Convertible Debt	Apr. 04, 2012 Senior Convertible Debt	Oct. 09, 2013 Senior Convertible Debt Capital Ventures International	Dec. 31, 2012 Senior Convertible Debt Capital Ventures International	Apr. 04, 2012 Senior Convertible Debt Capital Ventures International	Mar. 31, 2014 Senior Convertible Debt Capital Ventures International	Mar. 02, 2014 New Unsecured Senior Convertible Note	Mar. 31, 2014 New Unsecured Senior Convertible Note	Dec. 31, 2012 New Unsecured Senior Convertible Note	Apr. 04, 2012 New Unsecured Senior Convertible Note	Dec. 31, 2012 New Unsecured Senior Convertible Note Capital Ventures International	Dec. 03, 2012 New Unsecured Senior Convertible Note Capital Ventures International	Mar. 31, 2014 New Unsecured Senior Convertible Note Capital Ventures International	Dec. 31, 2012 New Unsecured Senior Convertible Note Capital Ventures International Minimum	Dec. 31, 2012 New Unsecured Senior Convertible Note Capital Ventures International Maximum	Nov. 15, 2013 Senior Secured Term Loan	Nov. 15, 2013 Senior Secured Term Loan Hercules Technology Growth Capital	Jun. 05, 2012 Senior Secured Term Loan Hercules Technology Growth Capital	Mar. 31, 2014 Senior Secured Term Loan Hercules Technology Growth Capital	Mar. 31, 2013 Senior Secured Term Loan Hercules Technology Growth Capital	Jun. 05, 2012 Senior Secured Term Loan Hercules Technology Growth Capital Minimum
Debt Instrument [Line Items]
Interest rate percentage																7.00%
Net proceeds after fees and expenses of purchase agreement																			$ 23,200,000
Conversion price																			$ 4.85			$ 3.10	$ 4.85	$ 3.19				$ 3.19	$ 4.85
Premium over closing price, percentage																			20.00%
Period before first installment payment																			4 months
Shares registered for resale																			10,262,311
Derivative liability of note	2,601,000	4,162,000																	3,800,000								1,500,000
Number of shares received from warrants received to purchase common stock																			3,094,060											256,410	256,410	139,276
Strike price per share																	$ 2.61		$ 5.45	$ 2.58										$ 1.95	$ 1.95	$ 3.59	$ 1.95
Fair value of warrants at issuance																			7,000,000								25,000,000					400,000
Legal and origination costs																											1,800,000						200,000	300,000
Amendment covenant description																									 Allowed the Company to convert, subject to the satisfaction of certain conditions set forth in the Exchanged Note, (a) at least $2.5 million of the approximately $5.3 million installment amount payable with respect to the January 2013 installment date (including approximately $4.2 million of deferred installment amounts from the period September 4, 2012 to December 3, 2012) into shares of the Company’s common stock (on December 21, 2012 the Company converted $3.8 million in deferred installment amount principal and interest and issued 1,715,443 shares of common stock), and (b) the balance of the January 2013 installment amount in equal amounts on each of the February and March 2013 installment dates;  Reduced the price failure equity condition with respect to a particular date of determination from $2.50 to $1.00;  Reduced the aggregate daily dollar trading volume equity condition required for at least 25 of the 30 consecutive trading days immediately preceding a date of determination from $1,500,000 to $850,000 per trading day. In addition, if the aggregate daily dollar trading volume was between $50,000 and $850,000, the Company could have still converted into common stock a portion of an installment amount payable with respect to an installment date equal to the quotient of (x) the aggregate daily dollar trading volume, divided by (y) $850,000;  Increased CVI’s beneficial ownership limitation under the Exchanged Note from 4.99% to 9.99%; and  Reduced the conversion price, from $4.85 per share of the Company’s common stock to $3.19 per share of the Company’s common stock, subject to certain price-based and other anti-dilution adjustments.
Portion of installment payment to be converted																												2,500,000
Installment amount of note payable																									5,300,000
Deferred installment payments of note payable																										4,200,000
Convertible amount of installment payment	24,407,000	18,896,000	720,000																						3,800,000
Number of shares issued for converted payment																									1,715,443
Price failure equity condition																												$ 1.00	$ 2.50
Aggregate daily dollar trading volume																		1,500,000							850,000			50,000	850,000
Minimum number of consecutive trading days for reducing daily dollar trading																									25 days
Number of trading days immediately preceding date of determination																									30 days
Beneficial ownership limitation percentage																												4.99%	9.99%
Increase in derivative liability																						500,000					500,000
Total debt discount being amortized into interest expense																											13,100,000						200,000
Non-cash interest expense amortization of debt discount	7,700,000	12,400,000												4,100,000	8,200,000																		500,000	600,000
Percentage of stock discount	85.00%
Non-cash interest expense issuing stock at discount	2,900,000	3,600,000
Number of trading days for valuation of shares	10 days
Debt conversion, shares issued											6,600,000		6,600,000								6,600,000
Loss on extinguishment of debt	(5,197,000)											(5,200,000)
Senior secured term loan																															10,000,000	10,000,000
Proceeds from the issuance of debt, net of expenses																															9,800,000	9,700,000
Interest rate on loan																																11.00%
Prime rate																																			3.75%
End of term fee																																	500,000	500,000
Interest expense	9,700,000	14,900,000																															1,000,000	1,200,000
Minimum amount of proceeds from specified asset dispositions for mandatory prepayment feature																																	1,000,000
Covenant, unrestricted cash balance requirement																															15,000,000		12,500,000
Proceeds from issuance of common stock																																	5,000,000
Repayments of term loan																																	2,500,000
Combined principal balances of the term loans		$ 15,380,000		$ 10,411,000	$ 10,411,000	$ 14,389,000	$ 20,944,000	$ 24,074,000	$ 25,000,000	$ 25,000,000																							$ 7,500,000

Warrants and Derivative Liabilities - Additional Information (Detail) (USD $)	1 Months Ended		12 Months Ended						1 Months Ended		12 Months Ended			1 Months Ended	3 Months Ended	1 Months Ended	12 Months Ended		1 Months Ended		12 Months Ended		1 Months Ended				12 Months Ended
	Nov. 15, 2013	Jun. 05, 2012	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Convertible Bond	Mar. 31, 2013 Convertible Bond	Mar. 31, 2014 Warrants And Derivative Liability	Mar. 31, 2013 Warrants And Derivative Liability	Mar. 02, 2014 Senior Convertible Debt	Mar. 02, 2014 New Unsecured Senior Convertible Note	Mar. 31, 2014 New Unsecured Senior Convertible Note	Dec. 31, 2012 New Unsecured Senior Convertible Note	Apr. 04, 2012 New Unsecured Senior Convertible Note	Nov. 15, 2013 Senior Secured Term Loan	Dec. 31, 2013 Senior Secured Term Loan Maximum	Mar. 02, 2014 Capital Ventures International	Mar. 31, 2014 Capital Ventures International	Mar. 31, 2013 Capital Ventures International	Oct. 09, 2013 Capital Ventures International Senior Convertible Debt	Apr. 04, 2012 Capital Ventures International Senior Convertible Debt	Mar. 31, 2014 Capital Ventures International Senior Convertible Debt	Mar. 31, 2014 Capital Ventures International New Unsecured Senior Convertible Note	Dec. 31, 2012 Capital Ventures International New Unsecured Senior Convertible Note Minimum	Dec. 31, 2012 Capital Ventures International New Unsecured Senior Convertible Note Maximum	Nov. 15, 2013 Hercules Technology Growth Capital Senior Secured Term Loan	Jun. 05, 2012 Hercules Technology Growth Capital Senior Secured Term Loan	Mar. 31, 2014 Hercules Technology Growth Capital Senior Secured Term Loan
Derivative [Line Items]
Number of shares received from warrants received to purchase common stock														256,410						3,094,060					256,410	139,276
Warrant exercise, waiting period																	6 months
Warrant exercise period																	5 years
Exercise price														$ 1.95					$ 2.61	$ 5.45	$ 2.58				$ 1.95	$ 3.59	$ 1.95
Beneficial ownership limitation percentage																							4.99%	9.99%
Required notification period																	61 days
Gain (loss) in change of fair value of derivative instruments and warrants			$ 1,872,000	$ 7,556,000	$ 500,000	$ 3,800,000	$ 100,000	$ 200,000							$ 1,000,000		$ 1,200,000	$ 3,600,000
Conversion price											$ 3.10	$ 4.85	$ 3.19							$ 4.85			$ 3.19	$ 4.85
Increase in derivative liability											$ 500,000											$ 500,000
Debt conversion, shares issued									6,600,000	6,600,000						6,600,000
Common stock, par value			$ 0.01	$ 0.01							$ 0.01
Convertible debt instrument redemption waiting period			1 year
Convertible debt instrument contractual term			30 months
Warrants expiration date	May 15, 2019	Dec. 05, 2017

Warrants and Derivative Liabilities - Schedule of Assumptions Used to Calculate the Fair Value of Warrants (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended							1 Months Ended			3 Months Ended								1 Months Ended			3 Months Ended								1 Months Ended			3 Months Ended
	Apr. 04, 2012	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 20, 2012 Post Modification	Dec. 20, 2012 Pre Modification	Apr. 04, 2012 Senior Convertible Note Warrant	Mar. 31, 2014 Senior Convertible Note Warrant	Dec. 31, 2013 Senior Convertible Note Warrant	Sep. 30, 2013 Senior Convertible Note Warrant	Jun. 30, 2013 Senior Convertible Note Warrant	Mar. 31, 2013 Senior Convertible Note Warrant	Dec. 31, 2012 Senior Convertible Note Warrant	Sep. 30, 2012 Senior Convertible Note Warrant	Jun. 30, 2012 Senior Convertible Note Warrant	Oct. 09, 2013 Senior Convertible Note Warrant Post Modification	Oct. 09, 2013 Senior Convertible Note Warrant Pre Modification	Jun. 05, 2012 Senior Secured Term Loan -– First Warrant	Mar. 31, 2014 Senior Secured Term Loan -– First Warrant	Dec. 31, 2013 Senior Secured Term Loan -– First Warrant	Sep. 30, 2013 Senior Secured Term Loan -– First Warrant	Jun. 30, 2013 Senior Secured Term Loan -– First Warrant	Mar. 31, 2013 Senior Secured Term Loan -– First Warrant	Dec. 31, 2012 Senior Secured Term Loan -– First Warrant	Sep. 30, 2012 Senior Secured Term Loan -– First Warrant	Jun. 30, 2012 Senior Secured Term Loan -– First Warrant	Nov. 15, 2013 Senior Secured Term Loan -– First Warrant Post Modification	Nov. 15, 2013 Senior Secured Term Loan -– First Warrant Pre Modification	Nov. 15, 2013 Senior Secured Term Loan – Second Warrant	Mar. 31, 2014 Senior Secured Term Loan – Second Warrant	Dec. 31, 2013 Senior Secured Term Loan – Second Warrant
Derivative [Line Items]
Risk-free interest rate	0.44%	0.12%	0.10%	0.21%	0.20%	0.23%	0.23%	0.33%	0.25%	0.25%	1.19%	1.11%	1.17%	1.02%	1.13%	0.67%	0.75%	0.63%	0.77%	1.05%	1.05%	0.77%	1.18%	1.24%	1.09%	1.20%	0.70%	0.75%	0.64%	0.80%	1.00%	1.00%	1.55%	1.76%	1.89%
Expected annual dividend yield	15.00%	16.50%	15.50%	16.70%	16.50%	16.50%	15.00%	16.00%	16.50%	16.50%
Expected volatility	75.00%	68.60%	66.30%	65.80%	66.90%	73.50%	70.00%	71.00%	72.50%	72.50%	80.00%	81.00%	75.60%	72.00%	71.90%	71.70%	80.60%	80.90%	80.80%	71.50%	71.50%	79.99%	80.73%	74.79%	72.10%	72.30%	72.01%	80.14%	81.18%	80.32%	72.64%	72.64%	76.97%	79.73%	80.37%
Term (years)	2 years 6 months	9 months	1 year	1 year 3 months 4 days	1 year 6 months 4 days	1 year 9 months 4 days	2 years 4 days	2 years 3 months 11 days	1 year 9 months 15 days	1 year 9 months 15 days	5 years 6 months	3 years 6 months 4 days	3 years 9 months 4 days	4 years 4 days	4 years 3 months 7 days	4 years 6 months 4 days	4 years 9 months 4 days	5 years 4 days	5 years 3 months 11 days	3 years 11 months 27 days	3 years 11 months 27 days	5 years 6 months	3 years 8 months 5 days	3 years 11 months 5 days	4 years 2 months 5 days	4 years 5 months 5 days	4 years 8 months 5 days	4 years 11 months 5 days	5 years 2 months 5 days	5 years 5 months 9 days	4 years 18 days	4 years 18 days	5 years 5 months 27 days	5 years 1 month 13 days	5 years 4 months 13 days
Fair value											$ 7.0	$ 2.2	$ 2.2	$ 2.5	$ 3.0	$ 3.4	$ 4.4	$ 7.1	$ 8.6	$ 3.2	$ 2.2	$ 0.4	$ 0.1	$ 0.1	$ 0.2	$ 0.2	$ 0.2	$ 0.2	$ 0.4	$ 0.5	$ 0.1	$ 0.1	$ 0.3	$ 0.3	$ 0.3

Warrants and Derivative Liabilities - Schedule of Fair Value Assumptions Used to Calculate Value of Convertible Note Derivative Feature (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended								1 Months Ended
	Apr. 04, 2012	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 20, 2012 Post Modification	Dec. 20, 2012 Pre Modification
Principal outstanding	$ 25,000		$ 10,411	$ 10,411	$ 14,389	$ 15,380	$ 20,944	$ 24,074	$ 25,000	$ 20,944	$ 24,074
Stock price	$ 3.97		$ 1.64	$ 2.34	$ 2.64	$ 2.67	$ 2.62	$ 4.15	$ 4.68	$ 2.95	$ 2.95
Percentage volume condition met	85.90%		87.20%	80.20%	87.50%	80.50%	94.50%	51.00%	75.20%	94.90%	28.60%
Expected volatility	75.00%		68.60%	66.30%	65.80%	66.90%	73.50%	70.00%	71.00%	72.50%	72.50%
Risk free rate	0.44%		0.12%	0.10%	0.21%	0.20%	0.23%	0.23%	0.33%	0.25%	0.25%
Bond yield	15.00%		16.50%	15.50%	16.70%	16.50%	16.50%	15.00%	16.00%	16.50%	16.50%
Recovery rate	30.00%		35.00%	35.00%	37.00%	30.00%	30.00%	30.00%	30.00%	30.00%	30.00%
Redeemable	yes	N/A	yes	yes	yes	yes	yes	yes	yes	yes	yes
Total time (years)	2 years 6 months		9 months	1 year	1 year 3 months 4 days	1 year 6 months 4 days	1 year 9 months 4 days	2 years 4 days	2 years 3 months 11 days	1 year 9 months 15 days	1 year 9 months 15 days
Dilution effect	yes	N/A	yes	yes	yes	yes	yes	yes	yes	yes	yes
Fair value	$ 3,800			$ 200	$ 5,444	$ 529	$ 1,000	$ 2,800	$ 4,500	$ 1,500	$ 900
Fair value as a percent of par	15.10%		0.02%	0.70%	3.30%	3.40%	4.90%	11.40%	17.90%	7.10%	3.90%

Income Taxes - Schedule of Income (Loss) Before Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Income Taxes [Abstract]
U.S.	$ (91,558)	$ (66,975)	$ (107,301)
Foreign	36,152	580	(28,157)
Loss before income tax (benefit) expense	$ (55,406)	$ (66,395)	$ (135,458)

Income Taxes - Schedule of Components of Income Tax Expense (Benefit) Attributable to Continuing Operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Income Taxes [Abstract]
Current, Federal	$ 287	$ 94
Current, State
Current, Foreign	614	(438)	1,369
Total current	901	(344)	1,369
Deferred, Federal	(49)	93
Deferred, State
Deferred, Foreign		(13)
Total deferred	(49)	80
Income tax (benefit) expense	$ 852	$ (264)	$ 1,369

Income Taxes - Schedule of Reconciliation of Statutory Federal Income Tax Rate to Effective Income Tax Rate (Detail)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Income Taxes [Abstract]
Statutory federal income tax rate	(34.00%)	(34.00%)	(34.00%)
State income taxes, net of federal benefit		(3.00%)	(2.00%)
Deemed dividend	1.00%	2.00%	3.00%
Foreign income tax rate differential	(6.00%)	(2.00%)	3.00%
Stock options	2.00%	(2.00%)	1.00%
Nondeductible expenses	1.00%	1.00%
Research and development tax credit		(1.00%)	(1.00%)
Deferred Warrants	(1.00%)
Interest expense	5.00%	7.00%
Extinguishment of debt	3.00%
Valuation allowance	30.00%	32.00%	31.00%
Effective income tax rate	1.00%		1.00%

Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Income Taxes [Abstract]
Net operating loss carryforwards	$ 260,254	$ 239,040
Research and development and other tax credit carryforwards	10,613	10,112
Accruals and reserves	36,214	35,490
Fixed assets and intangible assets	2,855	4,101
Other	19,594	18,292
Gross deferred tax assets	329,530	307,035
Valuation allowance	(282,824)	(261,961)
Total deferred tax assets	46,706	45,074
Intercompany debt	(36,102)	(35,185)
Other	(10,641)	(9,979)
Total deferred tax liabilities	(46,743)	(45,164)
Net deferred tax liabilities	$ (37)	$ (90)

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Mar. 31, 2014	Mar. 31, 2013
Deferred tax asset reflecting the benefit of deductions from the exercise of stock options	$ 13,900,000
Excess tax deductions from stock option exercised	52,400,000
Stock options exercised dates	March 31, 2006 through 2014
Repatriated amount	1,500,000
Deferred tax liabilities	7,761,000	5,444,000
Minimum percentage of amount being realized upon ultimate settlement	50.00%
Unrecognized tax benefits that, if recognized, would result in a reduction of the Company's effective tax rate	1,100,000	1,100,000
Austria
Net operating loss carryforwards	70,000,000
China
Net operating loss carryforwards	28,000,000
Federal
Net operating loss carryforwards	718,000,000
Research and development and other tax credit carryforwards	8,200,000
State
Net operating loss carryforwards	269,000,000
Research and development and other tax credit carryforwards	2,400,000
Foriegn Earnings Repatriated
Deferred tax liabilities	500,000
Power Quality Systems, Inc.
Net operating loss carryforwards	$ 3,700,000
Maximum
Operating loss carryforwards expiration years	Mar. 31, 2034
Expiration of other tax credit carryforwards	Mar. 31, 2034
Maximum \| Austria
Income tax examination years	2014
Maximum \| China
Income tax examination years	2013
Maximum \| U.S
Income tax examination years	2014
Minimum
Operating loss carryforwards expiration years	Mar. 31, 2015
Expiration of other tax credit carryforwards	Mar. 31, 2015
Minimum \| Austria
Income tax examination years	2007
Minimum \| China
Income tax examination years	2008
Minimum \| U.S
Income tax examination years	1995

Income Taxes - Schedule of Uncertainties in Income Tax Provision Liability (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Tax Disclosure [Abstract]
Beginning Balance	$ 1,061	$ 1,061
Increase for tax positions
Ending Balance	$ 1,061	$ 1,061

Stockholders' Equity - Components of Employee Stock-Based Compensation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	$ 10,696	$ 8,138	$ 9,864
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	2,730	3,389	6,177
Restricted Stock and Stock Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	7,936	4,698	3,633
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	$ 30	$ 51	$ 54

Stockholders' Equity - Additional Information (Detail) (USD $)	12 Months Ended					12 Months Ended												1 Months Ended	12 Months Ended		12 Months Ended	3 Months Ended		3 Months Ended	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2014 Stock Options	Mar. 31, 2013 Stock Options	Mar. 31, 2014 Stock Options Minimum	Mar. 31, 2014 Stock Options Maximum	Mar. 31, 2014 Restricted Stock and Stock Awards	Mar. 31, 2013 Restricted Stock and Stock Awards	Mar. 31, 2012 Restricted Stock and Stock Awards	Mar. 31, 2014 Restricted Stock and Stock Awards Minimum	Mar. 31, 2014 Restricted Stock and Stock Awards Maximum	Mar. 31, 2014 U.S. Treasury Rates Minimum	Mar. 31, 2014 U.S. Treasury Rates Maximum	Mar. 31, 2014 Performance-Based Restricted Stock	Mar. 31, 2013 Performance-Based Restricted Stock	Mar. 31, 2012 Performance-Based Restricted Stock	May 31, 2011 Restricted Stock Units (RSUs)	Mar. 31, 2014 2007 Director Stock Option Plan	Mar. 31, 2014 2007 Stock Incentive Plan	Mar. 31, 2014 Employee Stock Purchase Plan	Mar. 31, 2014 MLV & Co. LLC	Nov. 15, 2013 MLV & Co. LLC ATM Arrangement	Mar. 31, 2014 MLV & Co. LLC ATM Arrangement	Mar. 31, 2014 MLV & Co. LLC ATM Arrangement	Nov. 15, 2013 MLV & Co. LLC ATM Arrangement
Stockholders Equity [Line Items]
Unrecognized compensation cost for unvested employee stock-based compensation awards outstanding, net of forfeitures				$ 2,000,000	$ 3,500,000			$ 1,800,000	$ 5,800,000
Weighted-average period over which unrecognized compensation expense is expected to be recognized (years)				1 year 6 months					7 months 6 days
Weighted-average grant-date fair value of stock option awards granted	$ 1.62	$ 2.56	$ 6.02
Stock-based compensation plans expired terms													5 years	7 years
Total fair value of restricted stock granted								4,500,000	10,600,000	5,600,000
Total fair value of restricted stock granted for bonuses and severance								500,000	1,600,000
Total fair value of restricted stock vested								3,700,000	3,400,000	4,100,000
Total fair value of restricted stock granted for bonuses and severance									1,600,000
Restricted stock granted	1,945,610														402,015	1,422,127	109,211
Number of shares cancelled	194,112																	8,000
Stock-based compensation plans expired terms	May 02, 2007
Contractual life of options, in years	10 years
Vesting period, in years						3 years	5 years				2 years	5 years
Number of shares awarded annually																			3,000
Number of shares granted by option upon election to the board																			10,000
Grant date value of shares granted by option upon election to board																			40,000
Vesting period of shares granted by option upon election to board	2 years
Number of shares authorized for issuance under the plan																			159,000	2,879,559	99,963
Percentage of purchase discount																					15.00%
Compensation expense recognized	100,000	100,000	100,000
Common stock shares issued																					239,306
Common stock	789,000	603,000																					30,000,000			30,000,000
Commission on sale of common stock under the ATM																							3.00%			3.00%
Net proceeds from sale of common stock																						$ 4,100,000		$ 4,100,000	$ 7,500,000
Common stock, shares issued	78,929,903	60,300,466																				2,500,000		4,900,000	4,900,000
Sale price of common stock per share																						$ 1.74		$ 1.62	$ 1.62

Stockholders' Equity - Summary of Employee Stock-Based Compensation Expense by Financial Statement Line Item (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 10,696	$ 8,138	$ 9,864
Cost of Revenues
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	1,002	726	1,121
Research and Development Expense
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	2,751	2,456	2,562
Selling, General and Administrative Expenses
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 6,943	$ 4,956	$ 6,181

Stockholders' Equity - Summary of Employee and Non-Employee Stock Options Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2014
Stockholders' Equity [Abstract]
Options/Shares, Outstanding at March 31, 2013	2,671,194
Options/Shares, Granted at fair value	830,765
Options/Shares, Exercised
Options/Shares, Cancelled/Forfeited	(560,121)
Options/Shares, Outstanding at March 31, 2014	2,941,838
Options/Shares, Exercisable at March 31, 2014	1,484,288
Options/Shares, Fully vested and expected to vest at March 31, 2014	2,836,755
Weighted-Average Exercise Price, Outstanding at March 31, 2013	$ 13.77
Weighted-Average Exercise Price, Granted at fair value	$ 2.48
Weighted-Average Exercise Price, Exercised
Weighted-Average Exercise Price, Cancelled/Forfeited	$ 11.93
Weighted-Average Exercise Price, Outstanding at March 31, 2014	$ 10.93
Weighted-Average Exercise Price, Exercisable at March 31, 2014	$ 15.22
Weighted-Average Exercise Price, Fully vested and expected to vest at March 31, 2014	$ 11.15
Weighted-Average Remaining Contractual Term, Outstanding at March 31, 2014	6 years 8 months 12 days
Weighted-Average Remaining Contractual Term, Exercisable at March 31, 2014	5 years
Weighted-Average Remaining Contractual Term, Fully vested and expected to vest at March 31, 2014	6 years 7 months 6 days
Aggregate Intrinsic Value, Outstanding at March 31, 2014	$ 0
Aggregate Intrinsic Value, Outstanding at March 31, 2014	0
Aggregate Intrinsic Value, Fully vested and expected to vest at March 31, 2014	$ 0

Stockholders' Equity - Schedule of Weighted Average Assumptions Used in the Black-Scholes Valuation Model for Stock Options Granted (Detail)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Stockholders' Equity [Abstract]
Expected volatility	75.10%	72.00%	70.00%
Risk-free interest rate	1.70%	0.90%	1.80%
Expected life (years)	5 years 10 months 24 days	5 years 10 months 24 days	5 years 10 months 24 days
Dividend yield	0.00%	0.00%	0.00%

Stockholders' Equity - Summary of the Employee and Non-Employee Restricted Stock Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2014
Stockholders' Equity [Abstract]
Shares, Outstanding at April 1, 2013	2,404,825
Shares, Granted	1,945,610
Shares, Vested	(1,740,959)
Shares, Forfeited	(194,112)
Shares, Outstanding at March 31, 2014	2,415,364
Weighted Average Grant Date Fair Value, Outstanding at April 1, 2013	$ 4.58
Weighted Average Grant Date Fair Value, Granted	$ 2.30
Weighted Average Grant Date Fair Value, Vested	$ 3.91
Weighted Average Grant Date Fair Value, Forfeited	$ 3.54
Weighted Average Grant Date Fair Value, Outstanding at March 31, 2014	$ 3.34
sic Aggregate Value, Outstanding at March 31, 2014	$ 3,889

Commitments and Contingencies - Additional Information (Detail)	1 Months Ended			12 Months Ended			1 Months Ended											12 Months Ended		1 Months Ended
	Nov. 19, 2013 USD ($)	Jul. 05, 2011 Claim	May 12, 2011 Claim Employees	Mar. 31, 2014 USD ($) sqft	Mar. 31, 2013 USD ($)	Mar. 31, 2014 EUR (€)	Jun. 17, 2011 Bonds USD ($) Claim	Feb. 27, 2012 Sinovel Wind Group Co. Ltd. USD ($)	Feb. 27, 2012 Sinovel Wind Group Co. Ltd. CNY	Dec. 22, 2011 Sinovel Wind Group Co. Ltd. USD ($)	Dec. 22, 2011 Sinovel Wind Group Co. Ltd. CNY	Oct. 17, 2011 Sinovel Wind Group Co. Ltd. USD ($)	Oct. 17, 2011 Sinovel Wind Group Co. Ltd. CNY	Oct. 08, 2011 Sinovel Wind Group Co. Ltd. USD ($)	Oct. 08, 2011 Sinovel Wind Group Co. Ltd. CNY	Sep. 13, 2011 Sinovel Wind Group Co. Ltd. USD ($)	Sep. 13, 2011 Sinovel Wind Group Co. Ltd. CNY	Mar. 31, 2011 Sinovel Wind Group Co. Ltd. USD ($)	Mar. 31, 2011 Sinovel Wind Group Co. Ltd. CNY	Sep. 16, 2011 Dalian Guotong Electric Co. Ltd. USD ($)	Sep. 16, 2011 Dalian Guotong Electric Co. Ltd. CNY	May 12, 2011 Ghodawat Energy Pvt Ltd USD ($)	May 12, 2011 Ghodawat Energy Pvt Ltd EUR (€)
Commitments And Contingencies [Line Items]
Adverse purchase commitments				$ 402,000	$ 1,440,000
Adjusted accrual for adverse purchase commitments					7,800,000
Total space leased, square feet				316,000
Number of putative securities complaints			7				4
Number of officers putative securities filed against			2
Number of complaints additionally asserted claims against the underwriters			1
Sought compensation amount	10,000,000							17,000,000	105,000,000	190,000,000	1,200,000,000	157,000,000	1,000,000,000	58,000,000	370,000,000			76,000,000	485,000,000			24,000,000	18,000,000
Settlement amount expected to be funded by insurers	8,200,000
Settlement amount expected to be paid by issuance of common stock	1,800,000
Common stock, capital shares reserved for future issuance	944,882
Loss contingency				1,800,000
Number of claims consolidated		3
Fees and expenses for plaintiffs' counsel							500,000
Value of the undelivered components																		720,000,000	4,600,000,000
Damages claimed for unauthorized use of software																6,000,000	38,000,000
Monetary damages for trade secret infringement																453,000,000	2,900,000,000
Monetary losses from copyright infringement																				200,000	1,200,000
Counterclaims under License Agreement																						9,000,000	6,000,000
Restricted cash included in current assets				2,913,000	6,136,000
Restricted cash				3,394,000	4,820,000
Line of credit outstanding				$ 3,700,000		€ 2,700,000

Commitments and Contingencies - Schedule of Minimum Future Lease Commitments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014
Commitments And Contingencies [Line Items]
2015	$ 1,764
2016	1,166
2017	674
2018	423
2019	211
Thereafter	378
Total	$ 4,616

Employee Benefit Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
General Discussion Of Pension And Other Postretirement Benefits [Abstract]
Percentage of common stock matched under deferred compensation plan	50.00%
First certain percentage of eligible contribution under deferred compensation plan	6.00%
Recorded expense under deferred compensation plan	$ 0.4	$ 0.5	$ 0.7

Minority Investments - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Schedule Of Equity Method Investments [Line Items]
Impairment	$ (1,300,000)	$ (1,265,000)	$ (5,000,000)	$ (1,700,000)
Tres Amigas
Schedule Of Equity Method Investments [Line Items]
Number of commonly interconnected power grids	3	3
Equity method investment, aggregate cost	5,400,000	5,400,000
Equity method investment ownership percentage	26.00%	26.00%
Blade Dynamics Ltd
Schedule Of Equity Method Investments [Line Items]
Equity method investment in cash	8,000,000	8,000,000
Cost method investment ownership percentage	19.00%	19.00%
Impairment		$ (1,265,000)

Minority Investments - Schedule of Net Investment Activity (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Cumulative translation adjustment		$ 727	$ (887)	$ (1,790)
Impairment	(1,300)	(1,265)	(5,000)	(1,700)
Tres Amigas
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Beginning balance		2,853
Minority interest in net losses		(1,008)
Ending balance	1,845	1,845
Blade Dynamics Ltd.
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Beginning balance		4,611
Cumulative translation adjustment		344
Impairment		(1,265)
Ending balance	$ 3,690	$ 3,690

Restructuring and Impairments - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended			36 Months Ended
	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2014
Restructuring Cost And Reserve [Line Items]
Reduction in global workforce, percentage					68.00%
Employee severance and benefit costs		$ 1,700,000	$ 2,500,000	$ 5,300,000
Fair value of remaining lease payments			400,000
Facility exit costs				300,000
Asset impairment charge	$ 1,300,000	$ 1,265,000	$ 5,000,000	$ 1,700,000
Beijing, China
Restructuring Cost And Reserve [Line Items]
Space to be vacated, square feet			8,200
Klagenfurt, Austria
Restructuring Cost And Reserve [Line Items]
Space to be vacated, square feet			4,000	8,937
Middleton, WI
Restructuring Cost And Reserve [Line Items]
Space to be vacated, square feet				33,000
Nuremburg, Germany
Restructuring Cost And Reserve [Line Items]
Space to be vacated, square feet				3,300

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.

+ References+ Details

- Definition

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

+ References+ Details

Restructuring and Impairments - Schedule of Restructuring Charges and Cash Payments (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Restructuring Cost And Reserve [Line Items]
Accrued restructuring balance	$ 199	$ 974
Charges to operations	1,733	2,937
Cash payments	(873)	(3,712)
Non-cash/miscellaneous reductions	(215)
Accrued restructuring balance	844	199
Severance Pay and Benefits
Restructuring Cost And Reserve [Line Items]
Accrued restructuring balance	145	680
Charges to operations	1,710	2,501
Cash payments	(836)	(3,036)
Non-cash/miscellaneous reductions	(175)
Accrued restructuring balance	844	145
Facility Exit Costs
Restructuring Cost And Reserve [Line Items]
Accrued restructuring balance	54	294
Charges to operations	23	436
Cash payments	(37)	(676)
Non-cash/miscellaneous reductions	(39)
Accrued restructuring balance	$ 0	$ 54

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References+ Details

Business Segment and Geographic Information - Additional Information (Detail) (USD $)	12 Months Ended
	Mar. 31, 2014 MW Segment Customer	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Number of reportable business segments	2
Megawatts of drive trains and power ratings	2
Stock-based compensation expense	$ 10,696,000	$ 8,138,000	$ 9,864,000
Restructuring and impairment charges	3,000,000	7,900,000	9,200,000
Loss contingency accrual		1,800,000
Write-off of advanced payment to The Switch			$ 20,551,000
Number of customers	2
Inox Wind Limited
Segment Reporting Information [Line Items]
Risk percentage	31.00%	19.00%	18.00%
JCNE
Segment Reporting Information [Line Items]
Risk percentage	18.00%	13.00%
Doosan Heavy Industries
Segment Reporting Information [Line Items]
Risk percentage			11.00%
Outside The United States
Segment Reporting Information [Line Items]
Percentage of total revenue, by geographical region	87.00%	85.00%	72.00%

Business Segment and Geographic Information - Operating Results for Two Business Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Revenues	$ 16,287	$ 20,563	$ 24,181	$ 23,086	$ 20,419	$ 17,417	$ 20,867	$ 28,716	$ 84,117	$ 87,419	$ 76,543
Operating loss	(14,876)	(6,675)	(11,028)	(8,850)	(16,027)	(20,616)	(14,970)	(6,128)	(41,429)	(57,741)	(136,439)
Operating Segments \| Wind
Segment Reporting Information [Line Items]
Revenues									55,608	44,231	44,642
Operating loss									(5,213)	(16,098)	(62,217)
Operating Segments \| Grid
Segment Reporting Information [Line Items]
Revenues									28,509	43,188	31,901
Operating loss									(22,523)	(23,815)	(29,645)
Unallocated corporate expenses
Segment Reporting Information [Line Items]
Operating loss									$ (13,693)	$ (17,828)	$ (44,577)

Business Segment and Geographic Information - Total Business Segments Assets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 168,509	$ 216,754
Operating Segments \| Wind
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	36,701	67,111
Operating Segments \| Grid
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	54,342	72,800
Corporate assets
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 77,466	$ 76,843

Business Segment and Geographic Information - Geographic Information about Revenue, Based on Shipments to Customers by Region (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Revenues	$ 16,287	$ 20,563	$ 24,181	$ 23,086	$ 20,419	$ 17,417	$ 20,867	$ 28,716	$ 84,117	$ 87,419	$ 76,543
U.S
Segment Reporting Information [Line Items]
Revenues									11,013	13,197	21,347
Canada
Segment Reporting Information [Line Items]
Revenues									3,312	1,663	1,219
Europe
Segment Reporting Information [Line Items]
Revenues									7,453	14,709	2,868
China
Segment Reporting Information [Line Items]
Revenues									24,748	17,906	16,929
Korea
Segment Reporting Information [Line Items]
Revenues									6,429	10,945	12,486
India
Segment Reporting Information [Line Items]
Revenues									26,384	17,062	14,212
Australia
Segment Reporting Information [Line Items]
Revenues									$ 4,779	$ 11,937	$ 7,482

Business Segment and Geographic Information - Geographic Information about Property, Plant and Equipment Associated with Particular Regions (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 64,574	$ 74,626
North America
Segment Reporting Information [Line Items]
Property, plant and equipment, net	62,426	71,127
Europe
Segment Reporting Information [Line Items]
Property, plant and equipment, net	1,232	1,941
Asia Pacific
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 916	$ 1,558

Quarterly Financial Data - Schedule of Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Quarterly Financial Data [Abstract]
Total revenue	$ 16,287	$ 20,563	$ 24,181	$ 23,086	$ 20,419	$ 17,417	$ 20,867	$ 28,716	$ 84,117	$ 87,419	$ 76,543
Operating loss	(14,876)	(6,675)	(11,028)	(8,850)	(16,027)	(20,616)	(14,970)	(6,128)	(41,429)	(57,741)	(136,439)
Net loss	$ (22,705)	$ (8,417)	$ (14,623)	$ (10,513)	$ (19,773)	$ (20,135)	$ (15,949)	$ (10,275)	$ (56,258)	$ (66,131)	$ (136,827)
Net loss per common share—basic	$ (0.33)	$ (0.14)	$ (0.24)	$ (0.18)	$ (0.35)	$ (0.38)	$ (0.31)	$ (0.20)	$ (0.90)	$ (1.25)	$ (2.69)
Net loss per common share—diluted	$ (0.33)	$ (0.14)	$ (0.24)	$ (0.18)	$ (0.35)	$ (0.38)	$ (0.31)	$ (0.20)	$ (0.90)	$ (1.25)	$ (2.69)

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References+ Details

- Definition

+ References+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Valuation and Qualifying Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Allowance for Doubtful Accounts Receivable
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance, Beginning of Year	$ 0	$ 52	$ 683
Additions	16		6
Write-offs	0	(52)	(631)
Recoveries and Other Adjustments	0		(6)
Balance, End of Year	16	0	52
Deferred Tax Asset Valuation Allowance
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance, Beginning of Year	261,961	252,302	220,596
Additions	26,649	21,333	41,709
Write-offs	(5,786)	(11,674)	(10,003)
Recoveries and Other Adjustments	0
Balance, End of Year	$ 282,824	$ 261,961	$ 252,302

Subsequent Events	12 Months Ended
Subsequent Events	Mar. 31, 2014
Subsequent Events	19. Subsequent Events The Company has performed an evaluation of subsequent events through the time of filing this Annual Report on Form 10-K with the SEC, and has determined that there are no such events that are required to be disclosed.

Fair Value Disclosures - Schedule of Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis (Detail) (Investment in Unconsolidated Entity – Blade Dynamics, USD $) In Thousands, unless otherwise specified	Mar. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets	$ 3,690
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets	$ 3,690

Accounts Payable and Accrued Expenses - Additional Information (Detail)	12 Months Ended
	Mar. 31, 2014
Minimum
Product Warranty Accrual [Line Items]
Warranty period	1 year
Maximum
Product Warranty Accrual [Line Items]
Warranty period	3 years