American Superconductor (AMSC) 10-Q6 Feb 142014 Q3 Quarterly reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
Document and Entity Information	Dec. 31, 2013	Feb. 03, 2014
Document - Document and Entity Information [Line Items]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	31-Dec-13	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
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 Common Stock, Shares Outstanding	'	68,139,646

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2013	Mar. 31, 2013
Current assets:	'	'
Cash and cash equivalents	$35,394	$39,243
Accounts receivable, net	8,525	18,864
Inventory	25,167	33,473
Prepaid expenses and other current assets	19,538	22,469
Restricted cash	1,405	6,136
Total current assets	90,029	120,185
Property, plant and equipment, net	67,163	74,626
Intangibles, net	2,147	2,749
Restricted cash	4,901	4,820
Deferred tax assets	5,421	5,354
Other assets	8,710	9,020
Total assets	178,371	216,754
Current liabilities:	'	'
Accounts payable and accrued expenses	23,503	30,138
Note payable, current portion, net of discount of $677 as of December 31, 2013 and $458 as of March 31, 2013	6,272	4,158
Convertible note, current portion, net of discount of $1,287 as of December 31, 2013 and $4,289 as of March 31, 2013	9,125	4,610
Derivative liability	2,587	4,162
Adverse purchase commitments	429	1,440
Deferred revenue	10,023	29,805
Deferred tax liabilities	5,440	5,444
Total current liabilities	57,379	79,757
Note payable, net of discount of $384 as of December 31, 2013 and $95 as of March 31, 2013	7,283	3,367
Convertible note, net of discount of $600 as of March 31, 2013	'	5,881
Deferred revenue	1,318	1,340
Other liabilities	1,179	1,291
Total liabilities	67,159	91,636
Commitments and contingencies (Note 13)	'	'
Stockholders' equity:	'	'
Common stock	673	603
Additional paid-in capital	942,466	923,847
Treasury stock	-370	-313
Accumulated other comprehensive income	2,127	1,112
Accumulated deficit	-833,684	-800,131
Total stockholders' equity	111,212	125,118
Total liabilities and stockholders' equity	$178,371	$216,754

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2013	Mar. 31, 2013
Note payable, current portion, net of discount	$677	$458
Current portion of convertible note, net of discount	1,287	4,289
Note payable, net of current portion and discount	384	95
Convertible note net of current portion and discount	'	$600

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Revenues	$20,563	$17,417	$67,830	$67,000
Cost and operating expenses:	'	'	'	'
Cost of revenues	15,863	16,533	56,461	53,843
Research and development	2,951	3,948	9,061	11,480
Selling, general and administrative	8,232	10,769	27,741	36,304
Restructuring and impairments	108	6,702	872	6,845
Amortization of acquisition related intangibles	84	81	247	242
Total cost and operating expenses	27,238	38,033	94,382	108,714
Operating loss	-6,675	-20,616	-26,552	-41,714
Change in fair value of derivatives and warrants	535	5,217	1,890	6,114
Interest expense, net	-1,634	-4,553	-7,250	-10,191
Other expense, net	-341	-109	-908	-1,252
Loss before income tax (benefit) expense	-8,115	-20,061	-32,820	-47,043
Income tax (benefit) expense	302	74	733	-683
Net loss	($8,417)	($20,135)	($33,553)	($46,360)
Net loss per common share	'	'	'	'
Basic	($0.14)	($0.38)	($0.55)	($0.89)
Diluted	($0.14)	($0.38)	($0.55)	($0.89)
Weighted average number of common shares outstanding	'	'	'	'
Basic	62,309	52,792	60,578	51,966
Diluted	62,309	52,792	60,578	51,966

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive (Loss) Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Net loss	($8,417)	($20,135)	($33,553)	($46,360)
Other comprehensive (loss) income, net of tax:	'	'	'	'
Foreign currency translation (losses) gains	358	521	1,015	-206
Unrealized losses on investments	'	-8	'	-9
Total other comprehensive (loss) income, net of tax	358	513	1,015	-215
Comprehensive loss	($8,059)	($19,622)	($32,538)	($46,575)

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:	'	'
Net loss	($33,553)	($46,360)
Adjustments to reconcile net loss to net cash used in operations:	'	'
Depreciation and amortization	8,052	10,143
Stock-based compensation expense	7,328	5,968
Restructuring charges, net of payments	167	261
Impairment of long-lived and intangible assets	'	4,507
Provision for excess and obsolete inventory	287	957
Adverse purchase commitment losses (recoveries), net	'	-8,428
Loss on minority interest investments	789	1,914
Change in fair value of derivatives and warrants	-1,890	-6,114
Non-cash interest expense	5,902	8,404
Other non-cash items	1,181	1,790
Changes in operating asset and liability accounts:	'	'
Accounts receivable	10,414	6,085
Inventory	8,682	-8,173
Prepaid expenses and other current assets	3,462	4,699
Accounts payable and accrued expenses	-8,612	-20,330
Deferred revenue	-20,575	3,986
Net cash used in operating activities	-18,366	-40,691
Cash flows from investing activities:	'	'
Purchase of property, plant and equipment	-223	-1,259
Proceeds from the sale of property, plant and equipment	60	'
Proceeds from the maturity of marketable securities	'	5,297
Change in restricted cash	4,670	653
Change in other assets	-109	'
Net cash provided by investing activities	4,398	4,691
Cash flows from financing activities:	'	'
Employee taxes paid related to net settlement of equity awards	-57	-42
Proceeds from the issuance of debt, net of expenses	9,838	32,895
Repayment of debt	-3,462	-769
Proceeds from public equity offering, net	3,332	'
Proceeds from exercise of employee stock options and ESPP	99	178
Net cash provided by financing activities	9,750	32,262
Effect of exchange rate changes on cash and cash equivalents	369	-84
Net decrease in cash and cash equivalents	-3,849	-3,822
Cash and cash equivalents at beginning of year	39,243	46,279
Cash and cash equivalents at end of year	35,394	42,457
Supplemental schedule of cash flow information:	'	'
Cash paid for income taxes, net of refunds	'	-704
Issuance of common stock to settle liabilities	7,931	10,406
Cash paid for interest	$599	$543

Nature_of_the_Business_and_Ope

Nature of the Business and Operations and Liquidity	9 Months Ended
Nature of the Business and Operations and Liquidity	Dec. 31, 2013
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.
	These unaudited condensed consolidated financial statements of the Company have been prepared on a going concern basis in accordance with United States generally accepted accounting principles (“GAAP”) and the Securities and Exchange Commission’s (“SEC”) instructions to Form 10-Q. 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. Certain information and footnote disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to those instructions. The year-end condensed balance sheet data was derived from audited financial statements but does not include all disclosures required by GAAP. The unaudited condensed consolidated financial statements, in the opinion of management, reflect all adjustments (consisting of normal recurring adjustments) necessary for a fair statement of the results for the interim periods ended December 31, 2013 and 2012 and the financial position at December 31, 2013.
	Liquidity
	The Company has experienced recurring operating losses and as of December 31, 2013, the Company had an accumulated deficit of $833.7 million. In addition, the Company has experienced recurring negative operating cash flows, which has resulted in a decrease in its cash balance. These factors raise substantial doubt about the Company’s ability to continue as a going concern. These financial statements do not include any adjustments that might result from the outcome of this uncertainty. At December 31, 2013, the Company had cash and cash equivalents of $35.4 million. Cash used in operations for the nine months ended December 31, 2013 was $18.4 million.
	The Company expects that its cost reduction efforts undertaken to date will result in a reduction of cash used for operations during the fiscal year ending March 31, 2014, compared to the prior year. In July 2013, the Company reduced its workforce by approximately 7% and recorded restructuring charges for severance and other costs of approximately $0.1 million and $0.9 million during the three and nine months ended December 31, 2013, respectively. 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”). 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. (See Note 10, “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”), under which the Company borrowed an additional $10.0 million. The New Term Loan contains covenants and restrictions similar to the existing Term Loan. (See Note 10, “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 Quarterly Report on Form 10-Q.

	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 three months ended December 31, 2013, the Company received net proceeds of $3.3 million from sales of common stock under the ATM. (See Note 12, “Stockholders’ Equity”, for further information regarding the ATM.)

	In order for the Company to continue operations beyond the next twelve months and be able to discharge its liabilities and commitments in the normal course of business, the Company needs to increase sales through executing its strategy to broaden its customer base, enter new markets, and commercialize its superconductor product line. Otherwise, the Company may need to further reduce operating expenses in line with business conditions in order to decrease the amount of cash used in operations. The Company intends to work with the holder of its convertible note in order to maintain the ability to make monthly amortization payments on the convertible note in shares of common stock. 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 14, “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. In addition, the Company maintains the ability to sell shares of common stock under the ATM at its discretion to enhance liquidity.

	The Company must successfully execute on its plans to improve operating performance discussed above, raise additional capital either through the sale of one or both of its minority investments, or through the sale of shares of its common stock at its discretion under the ATM, and maintain the ability to pay monthly installment payments under the Exchanged Note in shares of common stock to ensure it has sufficient cash to fund its operations, capital expenditures and scheduled cash payments under its debt obligations through December 31, 2014. The Company’s ability to pay required monthly installment payments under the Exchanged Note in equity instead of cash is based on certain stock price and trading volume conditions that are outside of the Company’s control. If one or both of these equity conditions are not met (absent a waiver from the lender), the Company may be required to make required monthly installment payments in cash. As of the filing date of this Form 10-Q, the Company has only made payments to the lender in shares of common stock and as a result, the principal balance has been reduced by $14.6 million through December 31, 2013. If the Company fails one or both of the equity conditions, the Company can still make required payments in its common stock with a waiver from the lender, which has been provided in the past. There is no assurance that the lender will provide any waivers in the future. The Company’s liquidity is highly dependent on the factors discussed above, and its ability to maintain compliance with the covenants and restrictions on its debt obligations (or obtain waivers from our lenders in the event of non-compliance). There can be no assurance that the Company will be able to raise additional capital or be able to sell one or both of its minority investments on commercially reasonable terms or at all.
	The results of operations for an interim period are not necessarily indicative of the results of operations to be expected for the fiscal year. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements for the fiscal year ended March 31, 2013 (fiscal 2012) which are contained in the Company’s Annual Report on Form 10-K.

StockBased_Compensation

Stock-Based Compensation	9 Months Ended
Stock-Based Compensation	Dec. 31, 2013
Stock-Based Compensation	'
	2. Stock-Based Compensation
	The Company accounts for its stock-based compensation at fair value. The following table summarizes stock-based compensation expense by financial statement line item for the three and nine months ended December 31, 2013 and 2012 (in thousands):

		Three months ended					Nine months ended
		December 31,					December 31,
		2013		2012			2013			2012
	Cost of revenues	$	330	$	135		$	758		$	518
	Research and development		913		627			2,073			1,781
	Selling, general and administrative		1,797		1,167			4,497			3,669
	Total	$	3,040	$	1,929		$	7,328		$	5,968


	During the nine months ended December 31, 2013, the Company granted approximately 831,000 stock options, 1,307,000 restricted stock awards, 362,000 shares of performance-based restricted stock awards and issued 212,000 shares of common stock in-lieu of cash bonuses and severance payments to employees under the 2007 Stock Incentive Plan. The shares issued in-lieu of cash bonuses vested immediately. The shares issued in lieu of severance vested on the eighth day after receipt of an irrevocable release. The options and restricted stock awards granted vest upon the passage of time, generally 3 years. For options and awards that vest upon the passage of time, expense is being recorded over the vesting period. Performance-based restricted stock awards are expensed over the requisite service period.

	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 $2.6 million at December 31, 2013. This expense will be recognized over a weighted average expense period of approximately 1.8 years. The total unrecognized compensation cost for unvested outstanding restricted stock was $4.5 million at December 31, 2013. This expense will be recognized over a weighted-average expense period of approximately 0.7 years.

	The weighted-average assumptions used in the Black-Scholes valuation model for stock options granted during the three and nine months ended December 31, 2013 and 2012 are as follows:


		Three months ended					Nine months ended
		December 31,					December 31,
		2013		2012			2013			2012
	Expected volatility		N/A		72.4	%		75.1	%		72	%
	Risk-free interest rate		N/A		1	%		1.7	%		0.9	%
	Expected life (years)		N/A		5.9			5.9		5.9
	Dividend yield		N/A	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 United States Treasury rates. There were no stock options granted during the three months ended December 31, 2013.

Computation_of_Net_Loss_Per_Co

Computation of Net Loss Per Common Share	9 Months Ended
Computation of Net Loss Per Common Share	Dec. 31, 2013
Computation of Net Loss per Common Share	'



	3. 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. Where applicable, 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 each of the three and nine months ended December 31, 2013, 10.1 million shares were not included in the calculation of diluted EPS as they were considered anti-dilutive, of which 3.2 million relate to unvested stock options, 3.5 million relate to the issuance of warrants, and 3.4 million shares relate to the convertible feature of the Company’s Exchanged Note. For the three and nine months ended December 31, 2012, 11.8 million shares were not included in the calculation of diluted EPS as they were considered anti-dilutive, of which 2.9 million relate to unvested stock options, 3.2 million relate to the issue of warrants and 5.7 million shares related to the convertible feature of the Company’s Exchanged Note.

	The following table reconciles the numerators and denominators of the earnings per share calculation for the three and nine months ended December 31, 2013 and 2012 (in thousands, except per share data):



		Three months ended December 31,						Nine months ended December 31,
		2013			2012			2013			2012
	Numerator:
	Net loss	$	(8,417	)	$	(20,135	)	$	(33,553	)	$	(46,360	)
	Denominator:
	Weighted-average shares of common stock outstanding		64,442			53,745			62,256			52,558
	Weighted-average shares subject to repurchase		(2,133	)		(953	)		(1,678	)		(592	)
	Shares used in per-share calculation ― basic		62,309			52,792			60,578			51,966
	Shares used in per-share calculation ― diluted		62,309			52,792			60,578			51,966
		$	(0.14	)	$	(0.38	)	$	(0.55	)	$	(0.89	)

	Net loss per share ― basic
	Net loss per share ― diluted	$	(0.14	)	$	(0.38	)	$	(0.55	)	$	(0.89	)

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
Fair Value Measurements	Dec. 31, 2013
Fair Value Measurements	'
	4. Fair Value Measurements
	In January 2010, the Financial Accounting Standards Board (“FASB”) issued guidance related to disclosures of fair value measurements. The guidance requires gross presentation of activity within the Level 3 measurement roll-forward and details of transfers in and out of Level 1 and 2 measurements. It also clarifies two existing disclosure requirements on the level of disaggregation of fair value measurements and disclosures on inputs and valuation techniques. A change in the hierarchy of an investment from its current level will be 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 will be 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, Level 2 and Level 3 of the fair value measurement hierarchy during the three months ended December 31, 2013.

	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.
	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 carried at fair value, measured as of December 31, 2013 and March 31, 2013 (in thousands):



		Total			Quoted Prices in				Significant Other			Significant
		Carrying			Active Markets				Observable Inputs			Unobservable Inputs
		Value			(Level 1)				(Level 2)			(Level 3)
	December 31, 2013:
	Assets:
	Cash equivalents	$	12,671		$	12,671			$	-		$	-
	Liabilities:
	Derivative liability	$	-		$	-			$	-		$	-
	Warrants		2,587			-				-			2,587

		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		$		-	$		-
	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 (in thousands):

		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		(3,297	)		(2,817	)
	Balance at December 31, 2012	$	1,024		$	4,581
	Mark to market adjustment		(495	)		(948	)
	Balance at March 31, 2013	$	529		$	3,633




		Derivative
		Liability			Warrants
	April 1, 2013	$	529		$	3,633
	Warrant issuance with Senior Secured Term Loan		-			315
	Mark to market adjustment		(529	)		(1,361	)
	Balance at December 31, 2013	$	-		$	2,587

	Valuation Techniques
	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.
Derivative Liability
The Company has identified all of the derivatives (“Derivative Liability”) associated with the Exchanged Note which include put rights to require the investor to acquire an additional $15.0 million convertible note and additional warrants, holder change of control redemption rights, issuer optional redemption rights, sale redemption rights and a right to make payment in the form of stock rather than cash if certain equity conditions are met. The Derivative Liability is subject to revaluation at each balance sheet date, and any change in fair value will be recorded as a change in fair value of derivatives and warrants until the earlier of its exercise or expiration. The Company relies on assumptions in a lattice model to determine the fair value of the Derivative Liability. The Company has appropriately valued the Derivative Liability within Level 3 of the valuation hierarchy. (See Note 10, “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 Loans. (See Note 10, “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 of derivatives and warrants until the earlier of their exercise or expiration.
The Company relies on assumptions used 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 11, “Warrants and Derivative Liabilities”, for a discussion of the warrants and the valuation assumptions used.)

Accounts_Receivable

Accounts Receivable	9 Months Ended
Accounts Receivable	Dec. 31, 2013
Accounts Receivable	'
	5. Accounts Receivable

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


		December 31,			March 31,
		2013			2013
	Accounts receivable (billed)	$	7,551		$	17,222
	Accounts receivable (unbilled)		990			1,642
	Less: Allowance for doubtful accounts		(16	)		-
	Accounts receivable, net	$	8,525		$	18,864

Inventory

Inventory	9 Months Ended
Inventory	Dec. 31, 2013
Inventory	'
	6. Inventory

	The components of inventory at December 31, 2013 and March 31, 2013 are as follows (in thousands):


		December 31,		March 31,
		2013		2013
	Raw materials	$	6,532	$	5,966
	Work-in-process		2,706		3,427
	Finished goods		12,888		21,655
	Deferred program costs		3,041		2,425
	Net inventory	$	25,167	$	33,473

	The Company recorded inventory write-downs of $0.1 million and $0.5 million for the three months ended December 31, 2013 and 2012, respectively. The Company recorded inventory write-downs of $0.3 million and $1.0 million for the nine months ended December 31, 2013 and 2012, respectively. These write downs were based on evaluating its ending inventory on hand for excess quantities and obsolescence.
	Deferred program costs as of December 31, 2013 and March 31, 2013 primarily represent costs incurred on programs accounted for under contract accounting where the Company needs to complete development programs before revenue and costs will be recognized, respectively.

Accounts_Payable_and_Accrued_E

Accounts Payable and Accrued Expenses	9 Months Ended
Accounts Payable and Accrued Expenses	Dec. 31, 2013
Accounts Payable and Accrued Expenses	'
	7. Accounts Payable and Accrued Expenses

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


		December 31,			March 31,
		2013			2013
	Accounts payable	$	5,178		$	7,146
	Accrued miscellaneous expenses		6,024			9,142
	Accrued outside services		4,167			2,251
	Accrued subcontractor program costs		290			2,442
	Accrued compensation		4,369			6,315
	Income taxes payable		148			133
	Accrued warranty		3,327			2,709
	Total	$	23,503		$	30,138

	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.

	Product warranty activity was as follows (in thousands):


		Three months ended						Nine months ended
		December 31,						December 31,
		2013			2012			2013			2012
	Balance at beginning of period	$	3,069		$	4,792		$	2,709		$	5,896
	Change in accruals for warranties during the period		273			(627	)		767			(1,178	)
	Settlements during the period		(15	)		(147	)		(149	)		(700	)
	Balance at end of period	$	3,327		$	4,018		$	3,327		$	4,018

Income_Taxes

Income Taxes	9 Months Ended
Income Taxes	Dec. 31, 2013
Income Taxes	'



	8. Income Taxes
	For the three and nine months ended December 31, 2013, the Company recorded income tax expense of $0.3 million and $0.7 million, respectively. For the three and nine months ended December 31, 2012, the Company recorded income tax expense of $0.1 million and an income tax benefit of $0.7 million, respectively. For the three months ended December 31, 2013 and 2012, respectively, income tax expense was primarily due to income taxes in the Company’s foreign jurisdictions. In addition, income tax expense for the nine months ended December 31, 2013 included withholding taxes for repatriation of funds from certain foreign jurisdictions. The income tax benefit for the nine months ended December 31, 2012, was primarily due to a refund of Chinese income taxes of $0.9 million.

Restructuring

Restructuring	9 Months Ended
Restructuring	Dec. 31, 2013
Restructuring	'
	9. 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, 2013 and March 31, 2012, the Company undertook restructuring activities, approved by the Board of Directors, in order to reorganize its global operations, streamline various functions of the business, and reduce its global workforce to better reflect the demand for its products. The Company undertook an additional workforce reduction in July 2013, reducing its workforce by approximately 7%, impacting primarily selling, engineering and general and administrative functions. The Company recorded restructuring charges for severance and other costs of approximately $0.1 million and $0.9 million during the three and nine months ended December 31, 2013. From April 1, 2011 through December 31, 2013, these activities resulted in a substantial reduction of its global workforce. During the three and nine months ended December 31, 2012, the Company incurred restructuring costs of $6.7 million and $6.8 million, respectively. The costs related to the Company’s restructuring activities have been paid as of December 31, 2013.
	The following table presents restructuring charges and cash payments (in thousands):

		Severance pay			Facility
	Nine months ended December 31, 2013	and benefits			exit costs			Total
	Accrued restructuring balance at April 1, 2013	$	145		$	54		$	199
	Charges to operations		849			23			872
	Cash payments		(821	)		(37	)		(858	)
	Other adjustments		(173	)		(40	)		(213	)
	Accrued restructuring balance at December 31, 2013	$	-		$	-		$	-


	Nine months ended December 31, 2012
	Accrued restructuring balance at April 1, 2012	$	680		$	294		$	974
	Charges to operations		2,377			(39	)		2,338
	Cash payments		(1,673	)		(255	)		(1,928	)
	Accrued restructuring balance at December 31, 2012	$	1,384		$	-		$	1,384

	All restructuring charges discussed above are included within restructuring and impairments in the Company’s unaudited condensed consolidated statements of operations. The Company includes accrued restructuring within accounts payable and accrued expenses in the unaudited condensed consolidated balance sheets.

Debt

Debt	9 Months Ended
	Dec. 31, 2013
Debt	'
	10. Debt
	Senior Convertible Note
	On April 4, 2012, the Company entered into a Securities Purchase Agreement with Capital Ventures International (“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 Exchanged 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 has 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 11, “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 11, “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 as of the year ended March 31, 2013, 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 “First Amendment”) with CVI, which amended the Purchase Agreement. Pursuant to the First 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 is convertible into the Company’s common stock and has the same scheduled monthly installment payments as the Initial Note. The Exchanged Note provides the Company with additional flexibility to make monthly installment payments in shares of the Company’s common stock. The Company retains 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 is between $50,000 and $850,000, the Company may still convert 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 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 is being amortized into interest expense over the term of the Exchanged Note using the effective interest method. Under this method, interest expense is recognized each period until the debt instruments reach maturity. If the maturity of the Exchanged Note is accelerated because of prepayment, then the amortization will be 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 11 “Warrants and Derivative Liabilities” for discussion of the valuation of the Exchanged Warrant.

	During the three and nine months ended December 31, 2013, the Company recorded non-cash interest expense for amortization of the debt discount related to the Exchanged Note of $0.9 million and $3.6 million, respectively. During the three and nine months ended December 31, 2012, the Company recorded non-cash interest expense for amortization of the debt discount related to the Exchanged Note of $2.2 million and $6.4 million, respectively.

	Provided certain equity conditions are met, the Company may elect to repay principal and interest in shares of the Company’s common stock. If the Company elects to make a payment in shares of the Company’s common stock, the number of shares to be issued is 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 records 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 three months ended December 31, 2013, the Company made no payments in stock. During the nine months ended December 31, 2013, the Company recorded $1.8 million of non-cash interest expense related to installment payments made by issuing the Company’s common stock at a discount, compared to $1.5 million during the three and nine months ended December 31, 2012.
	The Exchanged Note and the Amended Purchase Agreement contain certain covenants and restrictions, including, among others, that for so long as the Exchanged Note is outstanding, the Company will not incur any indebtedness (other than permitted indebtedness under the Exchanged Note), permit liens on its properties (other than permitted liens under the Exchanged Note), make payments on junior securities or declare dividends. The Exchanged Note also contains limitations on the transfer of certain assets. Events of default under the Exchanged Note include failure to pay principal or interest as due on the Exchanged Note, failure to deliver registered shares of common stock upon the holders request for conversion of part or all of the Exchanged Note, failure to maintain the Company’s common stock eligible for trading on defined markets, cross defaults to other material indebtedness, receipt of uninsured judgments against the Company in excess of defined limits and other administrative covenants, including the Term Loan discussed below, as defined in the Exchanged Note and related documentation. Upon an event of default, the holders may require the Company to redeem all or any portion of the outstanding principal amount of the Exchanged Note in cash plus a penalty as specified in the agreement. Also, if the Company fails to maintain an effective registration statement covering common stock to be used in settling obligations under the Exchanged Note, the Company will be required to pay a penalty as specified in the agreement.
	Senior Secured Term Loans

	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 began repaying the Term Loan in equal monthly installments ending on December 1, 2014. In addition, Hercules received a warrant (the “First 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. 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 has accrued the term fee 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 have been recorded as a debt discount. The total debt discount including the First 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. During the three and nine months ended December 31, 2013, the Company recorded non-cash interest expense for amortization of the debt discount related to the Term Loan of $0.1 million and $0.4 million, respectively. During the three and nine months ended December 31, 2012, the Company recorded non-cash interest expense for amortization of the debt discount related to the Term Loan of $0.2 million and $0.5 million, respectively.

	On November 15, 2013, the Company amended the Term Loan with Hercules and entered into a New Term Loan (collectively with the Term Loan, the “Term Loans”), 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 achieves certain revenue targets for the six-month period ending March 31, 2014, interest only payments will continue through August 31, 2014. Once the interest-only period ends, 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 11, “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 three months ended December 31, 2013, 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 three months ended December 31, 2013, the Company recorded non-cash interest expense for amortization of the debt discount related to the New Term Loan of $0.1 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 in the United States of at least $15.0 million at the inception of the New Term Loan. This amount will be 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. 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 Exchanged Note and Term Loans as of the date of this Quarterly Report on Form 10-Q, 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 three and nine months ended December 31, 2013 was $1.6 million and $7.2 million, respectively, which included $1.1 million and $5.9 million, respectively, 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. Interest expense on the Exchanged Note and Term Loan for the three and nine months ended December 31, 2012 was $4.6 million, and $10.3 million, respectively, which included $3.9 million and $8.4 million, of non-cash interest expense related to the amortization of the debt discount on the Exchanged Note and Term Loan, respectively.

Warrants_and_Derivative_Liabil

Warrants and Derivative Liabilities	9 Months Ended
Warrants and Derivative Liabilities	Dec. 31, 2013
Warrants and Derivative Liabilities	'
	11. Warrants and Derivative Liabilities

	Senior Convertible Note Warrant

	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 10, “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 three months ended December 31, 2013, the exercise price of the Exchanged Warrant was reduced to $2.59 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, (See Note 10, “Debt” for further discussion), 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
		December 31,				October 9,				October 9,				September 30,				June 30,
	Fiscal Year 13	2013				2013				2013				2013				2013
	Risk-free interest rate		1.17	%			1.05	%			1.05	%			1.02	%			1.13	%
	Expected annual dividend yield		—	%			—	%			—	%			—	%			—	%
	Expected volatility		75.6	%			71.5	%			71.5	%			72	%			71.9	%
	Term (years)		3.76				3.99				3.99				4.01				4.27
	Fair value	$	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	%
	Term (years)		4.51				4.76				5.01				5.28				5.5
	Fair value	$	3.4 million			$	4.4 million			$	7.1 million			$	8.6 million			$	7.0 million

	The Company recorded a net gain, resulting from the decrease in the fair value of the Exchanged Warrant, including the impact of the modification, of $0.3 million and $1.2 million to change in fair value of derivatives and warrants in the three and nine months ended December 31, 2013, respectively. The Company recorded net gains of $2.7 million and $2.6 million in the three and nine months ended December 31, 2012, respectively.

	Senior 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 10, “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 three months ended December 31, 2013, the conversion price of the Exchanged Note was reduced to $3.15 per share.

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



		December 31,				September 30,				June 30,
	Fiscal Year 13	2013				2013				2013
	Principal outstanding (000's)	$	10,411			$	10,411			$	14,389
	Stock price	$	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	%			0.1	%			0.21	%
	Bond yield		16.5	%			15.5	%			16.7	%
	Recovery rate		35	%			35	%			37	%
	Redeemable	yes				yes				yes
	Total time (years)		0.75				1				1.26
	Dilution effect	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-				Pre-
										modification				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	%		75.2	%		85.9	%
Expected volatility		66.9	%			73.5	%			72.5	%			72.5	%			70	%		71	%		75	%
Risk free rate		0.2	%			0.23	%			0.25	%			0.25	%			0.23	%		0.33	%		0.44	%
Bond yield		16.5	%			16.5	%			16.5	%			16.5	%			15	%		16	%		15	%
Recovery rate		30	%			30	%			30	%			30	%			30	%		30	%		30	%
Redeemable		yes				yes				yes				yes				yes			yes			yes
Total time (years)		1.51				1.76				1.79				1.79				2.01			2.28			2.5
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 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 the decrease in the fair value of the derivative liabilities of $0.2 million and $0.5 million as a gain to changes in fair value of derivatives and warrants in the three and nine months ended December 31, 2013, and similarly, gains of $2.3 million and $3.3 million in the three and nine months ended December 31, 2012, respectively.

Senior Secured Term Loan – First Warrant

On June 5, 2012, the Company entered into the Loan and Security Agreement with Hercules. (See Note 10, “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 First Warrant as a liability due to certain provisions within the warrant, which requires that it be recorded at fair value. The First 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 First Warrant:

					Post-modification				Pre-modification
	December 31,				November 15,				November 15,				September 30,				June 30,
Fiscal Year 13	2013				2013				2013				2013				2013
Risk-free interest rate		1.24	%			1	%			1	%			1.09	%			1.2	%
Expected annual dividend yield	—		%		—		%		—		%		—		%		—		%
Expected volatility		74.79	%			72.64	%			72.64	%			72.1	%			72.3	%
Term (years)		3.93				4.05				4.05				4.18				4.43
Fair value	$ 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		0.7	%			0.75	%			0.64	%			0.8	%			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				5.5
Fair value	$ 0.2 million				$ 0.2 million				$ 0.4 million				$ 0.5 million				$ 0.4 million


The Company recorded a decrease in the fair value of the First Warrant resulting in a gain of less than $0.1 million during the three and nine months ended December 31, 2013. The Company recorded a decrease in the fair value of $0.2 million as a gain to change in fair value of derivatives and warrants during the three and nine months ended December 31, 2012.

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 10, “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
	December 31,				November 15,
Fiscal Year 13	2013				2013
Risk-free interest rate		1.89	%			1.55	%
Expected annual dividend yield	—		%		—		%
Expected volatility		80.37	%			76.97	%
Term (years)		5.37				5.49
Fair value	$ 0.3 million				$ 0.3 million

The Company recorded a decrease in the fair value of the Second Warrant resulting in a gain of less than $0.1 million during the three months ended December 31, 2013.

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.

Stockholders_Equity

Stockholders' Equity	9 Months Ended
Stockholders' Equity	Dec. 31, 2013
Stockholders' Equity	'

	12.Stockholders’ Equity

	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 three months ended December 31, 2013, the Company received net proceeds of $3.3 million, including sales commissions and offering expenses, from sales of approximately 2.4 million shares of its common stock at an average sales price of approximately $1.51 per share under the ATM.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Dec. 31, 2013
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 December 31, 2013, the Company reported a liability for adverse purchase commitments of $0.4 million. During the three and nine months ended December 31, 2013, the Company reduced its accrual for adverse purchase commitments by $0.5 million and $1.0 million, respectively, due to payments to certain vendors.
	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; one complaint additionally asserted claims against the underwriters who participated in our November 12, 2010 securities offering. On June 7, 2011, the United States District Court for the District of Massachusetts (the “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 our 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 (the “Securities Act”). The complaint alleges 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. that artificially inflated the value of the Company’s stock price. The complaint further alleges 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 district 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 district 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 May 17, 2013, the parties informed the district court that they had reached a settlement in principle, and requested a 30-day stay of the proceedings while the specific terms of the settlement continue to be negotiated. On November 19, 2013, the Company entered into a Stipulation and Agreement of Settlement (the “Stipulation”), which will resolve the claims asserted against the Company, 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 the Company’s 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”). 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 is required to make a cash payment for the difference in value. As of March 31, 2013, the Company established a reserve for the anticipated cost to settle this class action litigation. The terms of the Stipulation are subject to approval by the Court following notice to all class members. 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, as amended. 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 December 31, 2013.
	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 United States District Court for the District of Massachusetts. On July 5, 2011, the District Court consolidated three of these actions, and that matter is now 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 is 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 is captioned Krasnoff v. Budhraja, et al., Docket No. 7171. The allegations of the derivative complaints mirror the allegations made in the putative class action complaints described above. The plaintiffs purport 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 of the Company 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 the Company have admitted any fault, wrongdoing or concession of liability in connection with the terms of the Derivative Stipulation. The Derivative Stipulation will be filed with the Court within five business days of February 4, 2014. 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 of the Company, and the plaintiffs; (b) a requirement that the Company pay to plaintiffs’ counsel $475,000.00 for fees and expenses, which will be fully funded by the Company’s insurers; and (c) certain additions to the Company’s corporate governance policies, many of which have already been implemented. The Derivative Stipulation remains subject to preliminary and final approval by the Court and certain other conditions, including notice to stockholders. At this time, there can be no assurance that the Derivative Stipulation will receive the required approvals or that the settlement will become final. Based on the Company’s assessment that the probable losses on this claim are insignificant, no loss contingency was recorded as of December 31, 2013.
	On September 13, 2011, the Company commenced a series of legal actions in China against Sinovel Wind Group Co. Ltd. (“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 megawatt, (“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 million ($76 million) due to Sinovel’s breaches of its contracts. The Company is also seeking specific performance of our 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 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 million ($58 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 billion ($157 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 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 million ($17 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 million ($6 million) for our 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.
	Sinovel filed a new motion on June 18, 2012, to remove this case from the Beijing No. 1 Intermediate People’s Court to the court located in Gansu Province. On October 19, 2012, the court disallowed Sinovel’s motion due to its late filing.
	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 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 this 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. The Company is currently awaiting notice from the Beijing No. 1 Intermediate People’s Court regarding the first hearing date. 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 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 Sinovel’s appeal on May 29, 2013.
	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 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 million ($24 million). AMSC Austria filed an Answer to Request for Arbitration and Counterclaim (“Answer 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 million ($9 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 submissions’ hearing was conducted and the Company believes it will take several months for the Tribunal to render a decision. The Company has recorded a loss contingency based on its assessment of probable losses on this claim; however this amount of loss contingency that has been recorded 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.
	As of December 31, 2013 the Company had $1.4 million of restricted cash included in current assets, and $4.9 million 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.
	As of December 31, 2013, the Company had one performance bond in support of customer contracts. The total value of the outstanding performance bond is $0.2 million with an expiration date of March 2014. In the event that the payment is made in accordance with the requirements of any of these performance bonds, the Company would record the payment as an offset to revenue.
	The Company had an unused, unsecured line of credit consisting of €2.7 million (approximately $3.7 million) in Austria as of December 31, 2013.

Minority_Investments

Minority Investments	9 Months Ended
	Dec. 31, 2013
Minority Investments	'
	14. Minority Investments

	Investment in Tres Amigas LLC

	On October 9, 2009, 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, for $1.8 million, consisting of $0.8 million in cash and $1.0 million in AMSC common stock. On January 6, 2011 and May 20, 2011, the Company increased its minority position in Tres Amigas by investing an additional $1.8 million in cash on each date. As of December 31, 2013, 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 December 31, 2013. 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 expense, net, on the unaudited condensed consolidated statements of operations.

	The net investment activity for the nine months ended December 31, 2013 is as follows (in thousands):


	Balance at April 1, 2013	$	2,853
	Minority interest in net losses		(789	)
	Balance at December 31, 2013	$	2,064



	Investment in Blade Dynamics Ltd.

	On August 12, 2010, the Company acquired (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, for $8.0 million in cash. As of December 31, 2013, 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 unaudited condensed consolidated balance sheet and the equity in undistributed losses of Blade Dynamics is included in other expense, net, on the unaudited condensed consolidated statements of operations.

	The net investment activity for the nine months ended December 31, 2013 is as follows (in thousands):



	Balance at April 1, 2013	$	4,611
	Net foreign exchange rate impact		342
	Balance at December 31, 2013	$	4,953

Business_Segments

Business Segments	9 Months Ended
Business Segments	Dec. 31, 2013
Business Segments	'



	15. Business Segments
	The Company reported 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 manufacturers. Its design portfolio includes a broad range of drive trains and power ratings. 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):

		Three months ended						Nine months ended
		December 31,						December 31,
		2013			2012			2013			2012
	Revenues:
	Wind	$	13,545		$	6,808		$	42,937		$	35,321
	Grid		7,018			10,609			24,893			31,679
	Total	$	20,563		$	17,417		$	67,830		$	67,000



		Three months ended						Nine months ended
		December 31,						December 31,
		2013			2012			2013			2012
	Operating (loss) income:
	Wind	$	1,067		$	(5,365	)	$	(3,207	)	$	(10,514	)
	Grid		(4,670	)		(6,705	)		(15,287	)		(18,620	)
	Unallocated corporate expenses		(3,072	)		(8,546	)		(8,058	)		(12,580	)
	Total	$	(6,675	)	$	(20,616	)	$	(26,552	)	$	(41,714	)



	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. 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 $3.0 million and $7.3 million, and restructuring and impairment charges of $0.1 million and $0.9 million, for the three and nine months ended December 31, 2013, respectively. Unallocated corporate expenses primarily consist of stock-based compensation expense of $1.9 million and $6.0 million, respectively, and restructuring and impairment charges of $6.7 million and $6.8 million, respectively, for the three and nine months ended December 31, 2012, respectively.

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


		December 31,			March 31,
		2013			2013
	Wind	$	52,351		$	67,111
	Grid		58,354			72,800
	Corporate assets		67,666			76,843
	Total	$	178,371		$	216,754


	The following table sets forth customers who represented 10% or more of the Company’s total revenues for the three and nine months ended December 31, 2013 and 2012:


		Three months ended						Nine months ended
		December 31,						December 31,
		2013			2012			2013			2012
	INOX Wind Limited		35	%		19	%		25	%		17	%
	CSR Zhuzhou Institute Co., Ltd		18	%	—		%	<10		%	<10		%
	Beijing JINGCHENG New Energy Co., Ltd.	<10		%	<10		%		22	%		17	%
	CG Power Solutions UK Ltd	—		%		21	%	<10		%	<10		%
	E.ON Climate & Renewables	<10		%		19	%	<10		%	<10		%

Recent_Accounting_Pronouncemen

Recent Accounting Pronouncements	9 Months Ended
Recent Accounting Pronouncements	Dec. 31, 2013
Recent Accounting Pronouncements	'



	16. Recent Accounting Pronouncements
	In January 2013, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 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 our first quarter of fiscal 2013. The Company adopted ASU 2013-01 and it did not have a material impact on the Company’s consolidated results of operations, financial condition, or cash flows.
	In February 2013, the FASB issued ASU No. 2013-02, Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (ASU 2013-02). The amendments of this ASU require an entity to provide information about the amounts reclassified out of accumulated other comprehensive income (“AOCI”) by component. In addition, an entity is required to present, either on the face of the statement where net income (loss) is presented or in the notes, significant amounts reclassified out of AOCI by the respective line items of net income but only if the amount reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period. For other amounts that are not required under U.S. GAAP to be reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures required under U.S. GAAP that provide additional detail about those amounts. ASU 2013-02 is effective for fiscal years and interim periods beginning after December 15, 2012. The Company adopted ASU 2013-02 and it did not have a material impact on the Company’s consolidated results of operations, financial condition, or cash flows.
	In March 2013, the FASB issued ASU 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 is currently evaluating the impact of ASU 2013-05, but currently does not believe there will be a significant impact on the Company’s 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.
	The Company does not believe that other recently issued accounting pronouncements will have a material impact on its financial statements.

Subsequent_Events

Subsequent Events	9 Months Ended
Subsequent Events	Dec. 31, 2013
Subsequent Events	'

	17. Subsequent Events

	The Company has performed an evaluation of subsequent events through the time of filing this Quarterly Report on Form 10-Q with the SEC, and has determined that there are no such events that are required to be disclosed.

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	9 Months Ended
Stock-Based Compensation (Tables)	Dec. 31, 2013
Summary of Stock-Based Compensation Expense	'
	The Company accounts for its stock-based compensation at fair value. The following table summarizes stock-based compensation expense by financial statement line item for the three and nine months ended December 31, 2013 and 2012 (in thousands):

		Three months ended					Nine months ended
		December 31,					December 31,
		2013		2012			2013			2012
	Cost of revenues	$	330	$	135		$	758		$	518
	Research and development		913		627			2,073			1,781
	Selling, general and administrative		1,797		1,167			4,497			3,669
	Total	$	3,040	$	1,929		$	7,328		$	5,968

Schedule of Weighted Average Assumptions used in 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 three and nine months ended December 31, 2013 and 2012 are as follows:


		Three months ended					Nine months ended
		December 31,					December 31,
		2013		2012			2013			2012
	Expected volatility		N/A		72.4	%		75.1	%		72	%
	Risk-free interest rate		N/A		1	%		1.7	%		0.9	%
	Expected life (years)		N/A		5.9			5.9		5.9
	Dividend yield		N/A	None			None			None

Recovered_Sheet1

Computation of Net Loss per Common Share (Tables)	9 Months Ended
Computation of Net Loss per Common Share (Tables)	Dec. 31, 2013
Reconciliation of Numerators and Denominators of EPS Calculation	'

	The following table reconciles the numerators and denominators of the earnings per share calculation for the three and nine months ended December 31, 2013 and 2012 (in thousands, except per share data):



		Three months ended December 31,						Nine months ended December 31,
		2013			2012			2013			2012
	Numerator:
	Net loss	$	(8,417	)	$	(20,135	)	$	(33,553	)	$	(46,360	)
	Denominator:
	Weighted-average shares of common stock outstanding		64,442			53,745			62,256			52,558
	Weighted-average shares subject to repurchase		(2,133	)		(953	)		(1,678	)		(592	)
	Shares used in per-share calculation ― basic		62,309			52,792			60,578			51,966
	Shares used in per-share calculation ― diluted		62,309			52,792			60,578			51,966
		$	(0.14	)	$	(0.38	)	$	(0.55	)	$	(0.89	)

	Net loss per share ― basic
	Net loss per share ― diluted	$	(0.14	)	$	(0.38	)	$	(0.55	)	$	(0.89	)

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
Fair Value Measurements (Tables)	Dec. 31, 2013
Schedule of Assets and Liabilities Carried at Fair Value	'
	The following table provides the assets carried at fair value, measured as of December 31, 2013 and March 31, 2013 (in thousands):



		Total			Quoted Prices in				Significant Other			Significant
		Carrying			Active Markets				Observable Inputs			Unobservable Inputs
		Value			(Level 1)				(Level 2)			(Level 3)
	December 31, 2013:
	Assets:
	Cash equivalents	$	12,671		$	12,671			$	-		$	-
	Liabilities:
	Derivative liability	$	-		$	-			$	-		$	-
	Warrants		2,587			-				-			2,587

		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		$		-	$		-
	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 (in thousands):

		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		(3,297	)		(2,817	)
	Balance at December 31, 2012	$	1,024		$	4,581
	Mark to market adjustment		(495	)		(948	)
	Balance at March 31, 2013	$	529		$	3,633




		Derivative
		Liability			Warrants
	April 1, 2013	$	529		$	3,633
	Warrant issuance with Senior Secured Term Loan		-			315
	Mark to market adjustment		(529	)		(1,361	)
	Balance at December 31, 2013	$	-		$	2,587

Accounts_Receivable_Tables

Accounts Receivable (Tables)	9 Months Ended
Accounts Receivable (Tables)	Dec. 31, 2013
Schedule of Accounts Receivable	'

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


		December 31,			March 31,
		2013			2013
	Accounts receivable (billed)	$	7,551		$	17,222
	Accounts receivable (unbilled)		990			1,642
	Less: Allowance for doubtful accounts		(16	)		-
	Accounts receivable, net	$	8,525		$	18,864

Inventory_Tables

Inventory (Tables)	9 Months Ended
Inventory (Tables)	Dec. 31, 2013
Schedule of Inventory	'

	The components of inventory at December 31, 2013 and March 31, 2013 are as follows (in thousands):


		December 31,		March 31,
		2013		2013
	Raw materials	$	6,532	$	5,966
	Work-in-process		2,706		3,427
	Finished goods		12,888		21,655
	Deferred program costs		3,041		2,425
	Net inventory	$	25,167	$	33,473

Accounts_Payable_and_Accrued_E1

Accounts Payable and Accrued Expenses (Tables)	9 Months Ended
Accounts Payable and Accrued Expenses (Tables)	Dec. 31, 2013
Schedule of Accounts Payable and Accrued Expenses	'

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


		December 31,			March 31,
		2013			2013
	Accounts payable	$	5,178		$	7,146
	Accrued miscellaneous expenses		6,024			9,142
	Accrued outside services		4,167			2,251
	Accrued subcontractor program costs		290			2,442
	Accrued compensation		4,369			6,315
	Income taxes payable		148			133
	Accrued warranty		3,327			2,709
	Total	$	23,503		$	30,138

Schedule of Product Warranty Activity	'

	Product warranty activity was as follows (in thousands):


		Three months ended						Nine months ended
		December 31,						December 31,
		2013			2012			2013			2012
	Balance at beginning of period	$	3,069		$	4,792		$	2,709		$	5,896
	Change in accruals for warranties during the period		273			(627	)		767			(1,178	)
	Settlements during the period		(15	)		(147	)		(149	)		(700	)
	Balance at end of period	$	3,327		$	4,018		$	3,327		$	4,018

Restructuring_Tables

Restructuring (Tables)	9 Months Ended
Restructuring (Tables)	Dec. 31, 2013
Schedule of Restructuring Charges and Cash Payments	'
	The following table presents restructuring charges and cash payments (in thousands):

		Severance pay			Facility
	Nine months ended December 31, 2013	and benefits			exit costs			Total
	Accrued restructuring balance at April 1, 2013	$	145		$	54		$	199
	Charges to operations		849			23			872
	Cash payments		(821	)		(37	)		(858	)
	Other adjustments		(173	)		(40	)		(213	)
	Accrued restructuring balance at December 31, 2013	$	-		$	-		$	-


	Nine months ended December 31, 2012
	Accrued restructuring balance at April 1, 2012	$	680		$	294		$	974
	Charges to operations		2,377			(39	)		2,338
	Cash payments		(1,673	)		(255	)		(1,928	)
	Accrued restructuring balance at December 31, 2012	$	1,384		$	-		$	1,384

Warrants_and_Derivative_Liabil1

Warrants and Derivative Liabilities (Tables)	9 Months Ended
Warrants and Derivative Liabilities (Tables)	Dec. 31, 2013
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 features:



		December 31,			September 30,			June 30,
	Fiscal Year 13	2013			2013			2013
	Principal outstanding (000's)	$	10,411		$	10,411		$	14,389
	Stock price	$	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	%		0.1	%		0.21	%
	Bond yield		16.5	%		15.5	%		16.7	%
	Recovery rate		35	%		35	%		37	%
	Redeemable	yes			yes			yes
	Total time (years)		0.75			1			1.26
	Dilution effect	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-			Pre-
								modification			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	%		75.2	%		85.9	%
	Expected volatility		66.9	%		73.5	%		72.5	%		72.5	%		70	%		71	%		75	%
	Risk free rate		0.2	%		0.23	%		0.25	%		0.25	%		0.23	%		0.33	%		0.44	%
	Bond yield		16.5	%		16.5	%		16.5	%		16.5	%		15	%		16	%		15	%
	Recovery rate		30	%		30	%		30	%		30	%		30	%		30	%		30	%
	Redeemable		yes			yes			yes			yes			yes			yes			yes
	Total time (years)		1.51			1.76			1.79			1.79			2.01			2.28			2.5
	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
		December 31,			October 9,			October 9,			September 30,			June 30,
	Fiscal Year 13	2013			2013			2013			2013			2013
	Risk-free interest rate		1.17	%		1.05	%		1.05	%		1.02	%		1.13	%
	Expected annual dividend yield		—	%		—	%		—	%		—	%		—	%
	Expected volatility		75.6	%		71.5	%		71.5	%		72	%		71.9	%
	Term (years)		3.76			3.99			3.99			4.01			4.27
	Fair value	$	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	%
	Term (years)		4.51			4.76			5.01			5.28			5.5
	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 First Warrant:

					Post-modification			Pre-modification
		December 31,			November 15,			November 15,			September 30,			June 30,
	Fiscal Year 13	2013			2013			2013			2013			2013
	Risk-free interest rate		1.24	%		1	%		1	%		1.09	%		1.2	%
	Expected annual dividend yield	—		%	—		%	—		%	—		%	—		%
	Expected volatility		74.79	%		72.64	%		72.64	%		72.1	%		72.3	%
	Term (years)		3.93			4.05			4.05			4.18			4.43
	Fair value	$ 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		0.7	%		0.75	%		0.64	%		0.8	%		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			5.5
	Fair value	$ 0.2 million			$ 0.2 million			$ 0.4 million			$ 0.5 million			$ 0.4 million

Senior Secured Term Loan b 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
		December 31,			November 15,
	Fiscal Year 13	2013			2013
	Risk-free interest rate		1.89	%		1.55	%
	Expected annual dividend yield	—		%	—		%
	Expected volatility		80.37	%		76.97	%
	Term (years)		5.37			5.49
	Fair value	$ 0.3 million			$ 0.3 million

Minority_Investments_Tables

Minority Investments (Tables)	9 Months Ended
	Dec. 31, 2013
Tres Amigas	'
Schedule of Net Investment Activity	'

	The net investment activity for the nine months ended December 31, 2013 is as follows (in thousands):


	Balance at April 1, 2013	$	2,853
	Minority interest in net losses		(789	)
	Balance at December 31, 2013	$	2,064



Blade Dynamics Ltd.	'
Schedule of Net Investment Activity	'

	The net investment activity for the nine months ended December 31, 2013 is as follows (in thousands):



	Balance at April 1, 2013	$	4,611
	Net foreign exchange rate impact		342
	Balance at December 31, 2013	$	4,953

Business_Segments_Tables

Business Segments (Tables)	9 Months Ended
Business Segments (Tables)	Dec. 31, 2013
Operating Results for Two Business Segments	'
	The operating results for the two business segments are as follows (in thousands):

		Three months ended						Nine months ended
		December 31,						December 31,
		2013			2012			2013			2012
	Revenues:
	Wind	$	13,545		$	6,808		$	42,937		$	35,321
	Grid		7,018			10,609			24,893			31,679
	Total	$	20,563		$	17,417		$	67,830		$	67,000



		Three months ended						Nine months ended
		December 31,						December 31,
		2013			2012			2013			2012
	Operating (loss) income:
	Wind	$	1,067		$	(5,365	)	$	(3,207	)	$	(10,514	)
	Grid		(4,670	)		(6,705	)		(15,287	)		(18,620	)
	Unallocated corporate expenses		(3,072	)		(8,546	)		(8,058	)		(12,580	)
	Total	$	(6,675	)	$	(20,616	)	$	(26,552	)	$	(41,714	)



Total Business Segments Assets	'

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


		December 31,			March 31,
		2013			2013
	Wind	$	52,351		$	67,111
	Grid		58,354			72,800
	Corporate assets		67,666			76,843
	Total	$	178,371		$	216,754

Schedule of Revenues by Major Customers	'

	The following table sets forth customers who represented 10% or more of the Company’s total revenues for the three and nine months ended December 31, 2013 and 2012:


		Three months ended						Nine months ended
		December 31,						December 31,
		2013			2012			2013			2012
	INOX Wind Limited		35	%		19	%		25	%		17	%
	CSR Zhuzhou Institute Co., Ltd		18	%	—		%	<10		%	<10		%
	Beijing JINGCHENG New Energy Co., Ltd.	<10		%	<10		%		22	%		17	%
	CG Power Solutions UK Ltd	—		%		21	%	<10		%	<10		%
	E.ON Climate & Renewables	<10		%		19	%	<10		%	<10		%

Nature_of_the_Business_and_Ope1

Nature of the Business and Operations and Liquidity - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended	9 Months Ended							3 Months Ended
	Jul. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Apr. 04, 2012	Jun. 05, 2012	Nov. 15, 2013	Dec. 31, 2013	Nov. 15, 2013
							Senior Convertible Debt	Senior Secured Term Loan	New Term Loan	MLV & Co. LLC	MLV & Co. LLC
										ATM Arrangement	ATM Arrangement
Description Of Business [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Accumulated deficit	'	($833,684,000)	($833,684,000)	'	($800,131,000)	'	'	'	'	'	'
Cash and cash equivalents	'	35,394,000	35,394,000	42,457,000	39,243,000	46,279,000	'	'	'	'	'
Net cash used in operating activities	'	'	-18,366,000	-40,691,000	'	'	'	'	'	'	'
Debt, face amount	'	'	'	'	'	'	25,000,000	10,000,000	10,000,000	'	'
Reduction in global workforce, percentage	7.00%	'	'	'	'	'	'	'	'	'	'
Restructuring charge for severance and other costs	'	100,000	900,000	'	'	'	'	'	'	'	'
Interest rate percentage	'	'	'	'	'	'	7.00%	'	'	'	'
Common stock	'	673,000	673,000	'	603,000	'	'	'	'	'	30,000,000
Net proceeds from sale of common stock	'	'	'	'	'	'	'	'	'	3,300,000	'
Reduction of principle from conversion of shares	'	'	$14,600,000	'	'	'	'	'	'	'	'

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)	9 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2013
Stock Options	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'
Stock options granted in period	831,000
Vesting period, in years	'3 years
Unrecognized compensation cost for unvested employee stock-based compensation awards outstanding, net of forfeitures	$2.60
Weighted-average period over which unrecognized compensation expense is expected to be recognized (years)	'1 year 9 months 18 days
2007 Stock Incentive Plan	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'
Stock options granted in period	212,000
Restricted Stock Units	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'
Restricted stock granted	1,307,000
Performance-Based Restricted Stock	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'
Restricted stock granted	362,000
Restricted Stock	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'
Unrecognized compensation cost for unvested employee stock-based compensation awards outstanding, net of forfeitures	$4.50
Weighted-average period over which unrecognized compensation expense is expected to be recognized (years)	'8 months 12 days
U.S. Treasury Rates \| Minimum	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'
Stock-based compensation plans expired terms	'5 years
U.S. Treasury Rates \| Maximum	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'
Stock-based compensation plans expired terms	'7 years

StockBased_Compensation_Summar

Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]	'	'	'	'
Total stock-based compensation expense	$3,040	$1,929	$7,328	$5,968
Cost of Revenues	'	'	'	'
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]	'	'	'	'
Total stock-based compensation expense	330	135	758	518
Research and Development	'	'	'	'
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]	'	'	'	'
Total stock-based compensation expense	913	627	2,073	1,781
Selling, General and Administrative	'	'	'	'
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]	'	'	'	'
Total stock-based compensation expense	$1,797	$1,167	$4,497	$3,669

StockBased_Compensation_Schedu

Stock-Based Compensation - Schedule of Weighted Average Assumptions used in Black-Scholes Valuation Model for Stock Options Granted (Detail)	3 Months Ended		9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Expected volatility	0.00%	72.40%	75.10%	72.00%
Risk-free interest rate	0.00%	1.00%	1.70%	0.90%
Expected life (years)	'0 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%	0.00%

Computation_of_Net_Loss_Per_Co1

Computation of Net Loss Per Common Share - Additional Information (Detail)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]	'	'	'	'
Anti-dilutive shares excluded from calculation of diluted EPS	10.1	11.8	10.1	11.8
Unvested Options	'	'	'	'
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]	'	'	'	'
Anti-dilutive shares excluded from calculation of diluted EPS	3.2	2.9	3.2	2.9
Warrants	'	'	'	'
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]	'	'	'	'
Anti-dilutive shares excluded from calculation of diluted EPS	3.5	3.2	3.5	3.2
Convertible Notes	'	'	'	'
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]	'	'	'	'
Anti-dilutive shares excluded from calculation of diluted EPS	3.4	5.7	3.4	5.7

Computation_of_Net_Loss_Per_Co2

Computation of Net Loss Per Common Share - Reconciliation of Numerators and Denominators of EPS Calculation (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Net loss	($8,417)	($20,135)	($33,553)	($46,360)
Weighted-average shares of common stock outstanding	64,442	53,745	62,256	52,558
Weighted-average shares subject to repurchase	-2,133	-953	-1,678	-592
Shares used in per-share calculation b basic	62,309	52,792	60,578	51,966
Shares used in per-share calculation b diluted	62,309	52,792	60,578	51,966
Basic	($0.14)	($0.38)	($0.55)	($0.89)
Diluted	($0.14)	($0.38)	($0.55)	($0.89)

Fair_Value_Measurements_Schedu

Fair Value Measurements - Schedule of Assets and Liabilities Carried at Fair Value (Detail) (USD $)	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Apr. 04, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	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	$12,671	'	'	$18,649	'	'	'	'
Derivative liability	'	200	500	529	1,000	2,800	900	3,800
Warrants	2,587	'	'	3,633	'	'	'	'
Quoted Prices in Active Markets (Level 1)	'	'	'	'	'	'	'	'
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]	'	'	'	'	'	'	'	'
Cash equivalents	12,671	'	'	18,649	'	'	'	'
Derivative liability	'	'	'	'	'	'	'	'
Warrants	'	'	'	'	'	'	'	'
Significant Other Observable Inputs (Level 2)	'	'	'	'	'	'	'	'
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]	'	'	'	'	'	'	'	'
Cash equivalents	'	'	'	'	'	'	'	'
Derivative liability	'	'	'	'	'	'	'	'
Warrants	'	'	'	'	'	'	'	'
Significant Unobservable Inputs (Level 3)	'	'	'	'	'	'	'	'
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]	'	'	'	'	'	'	'	'
Cash equivalents	'	'	'	'	'	'	'	'
Derivative liability	'	'	'	529	'	'	'	'
Warrants	$2,587	'	'	$3,633	'	'	'	'

Fair_Value_Measurements_Schedu1

Fair Value Measurements - Schedule of Liabilities Measured at Fair Value (Detail) (USD $)	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Derivative Liability	'	'	'	'
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]	'	'	'	'
Beginning Balance	'	$529	$1,024	'
Valuation of derivative liability	'	'	3,779	'
Warrant issuance with Senior Convertible Note	'	'	'	'
Warrant issuance with Senior Secured Term Loan	'	'	'	'
Valuation of derivative liability attributable to modification	'	'	542	'
Mark to market adjustment	-529	-495	-3,297	'
Ending Balance	'	529	1,024	'
Warrants	'	'	'	'
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]	'	'	'	'
Beginning Balance	2,587	3,633	4,581	'
Valuation of derivative liability	'	'	'	'
Warrant issuance with Senior Convertible Note	'	'	7,018	'
Warrant issuance with Senior Secured Term Loan	315	'	380	'
Valuation of derivative liability attributable to modification	'	'	'	'
Mark to market adjustment	-1,361	-948	-2,817	'
Ending Balance	$2,587	$3,633	$4,581	'

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Amount of additional convertible notes and warrants	$15

Accounts_Receivable_Schedule_o

Accounts Receivable - Schedule of Accounts Receivable (Detail) (USD $)	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2013	Mar. 31, 2013
Accounts Notes And Loans Receivable [Line Items]	'	'
Accounts receivable (billed)	$7,551	$17,222
Accounts receivable (unbilled)	990	1,642
Less: Allowance for doubtful accounts	-16	'
Accounts receivable, net	$8,525	$18,864

Inventory_Schedule_of_Inventor

Inventory - Schedule of Inventory (Detail) (USD $)	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2013	Mar. 31, 2013
Inventory [Line Items]	'	'
Raw materials	$6,532	$5,966
Work-in-process	2,706	3,427
Finished goods	12,888	21,655
Deferred program costs	3,041	2,425
Net inventory	$25,167	$33,473

Inventory_Additional_Informati

Inventory - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Inventory [Line Items]	'	'	'	'
Inventory write-down	$100	$500	$287	$957

Accounts_Payable_and_Accrued_E2

Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) (USD $)	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2013	Mar. 31, 2013
Accounts payable	$5,178	$7,146
Accrued miscellaneous expenses	6,024	9,142
Accrued outside services	4,167	2,251
Accrued subcontractor program costs	290	2,442
Accrued compensation	4,369	6,315
Income taxes payable	148	133
Accrued warranty	3,327	2,709
Total	$23,503	$30,138

Accounts_Payable_and_Accrued_E3

Accounts Payable and Accrued Expenses - Schedule of Product Warranty Activity (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Balance at beginning of period	$3,069	$4,792	$2,709	$5,896
Change in accruals for warranties during the period	273	-627	767	-1,178
Settlements during the period	-15	-147	-149	-700
Balance at end of period	$3,327	$4,018	$3,327	$4,018

Accounts_Payable_and_Accrued_E4

Accounts Payable and Accrued Expenses - Additional Information (Detail)	9 Months Ended
	Dec. 31, 2013
Minimum	'
Product Warranty Accrual [Line Items]	'
Warranty period	'1 year
Maximum	'
Product Warranty Accrual [Line Items]	'
Warranty period	'3 years

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Income tax expense (benefit)	$302,000	$74,000	$733,000	($683,000)
Foreign income tax benefit	'	'	'	$900,000

Restructuring_Schedule_of_Rest

Restructuring - Schedule of Restructuring Charges and Cash Payments (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost And Reserve [Line Items]	'	'
Accrued restructuring balance	$199	$974
Charges to operations	872	2,338
Cash payments	-858	-1,928
Other adjustments	-213	'
Accrued restructuring balance	'	1,384
Severance Pay and Benefits	'	'
Restructuring Cost And Reserve [Line Items]	'	'
Accrued restructuring balance	145	680
Charges to operations	849	2,377
Cash payments	-821	-1,673
Other adjustments	-173	'
Accrued restructuring balance	'	1,384
Facility Exit Costs	'	'
Restructuring Cost And Reserve [Line Items]	'	'
Accrued restructuring balance	54	294
Charges to operations	23	-39
Cash payments	-37	-255
Other adjustments	-40	'
Accrued restructuring balance	'	'

Restructuring_Additional_Infor

Restructuring - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Jul. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost And Reserve [Line Items]	'	'	'	'	'
Reduction in global workforce, percentage	7.00%	'	'	'	'
Severance and other costs	'	$0.10	'	$0.90	'
Restructuring and impairment charges	'	$0.10	$6.70	$0.90	$6.80

Debt_Additional_Information_De

Debt - Additional Information (Detail) (USD $)

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

0 Months Ended

1 Months Ended

3 Months Ended

9 Months Ended

1 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

1 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

0 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Sep. 30, 2012

Jun. 30, 2012

Apr. 04, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Apr. 04, 2012

Oct. 09, 2013

Apr. 04, 2012

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Apr. 04, 2012

Dec. 31, 2012

Dec. 03, 2012

Dec. 31, 2013

Mar. 31, 2013

Dec. 31, 2012

Nov. 15, 2013

Jun. 05, 2012

Dec. 31, 2013

Mar. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Mar. 31, 2013

Jun. 05, 2012

Senior Convertible Debt

New Unsecured Senior Convertible Note

Senior Secured Term Loan

Capital Ventures International

Hercules Technology Growth Capital

Minimum

Maximum

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

$3.15

$4.85

$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

2,587,000

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

139,276

Strike price per share

$2.61

$5.45

$2.59

$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

'o 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 Companybs 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; o Reduced the price failure equity condition with respect to a particular date of determination from $2.50 to $1.00; o 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 is between $50,000 and $850,000, the Company may still convert 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; o Increased CVIbs beneficial ownership limitation under the Exchanged Note from 4.99% to 9.99%; and o Reduced the conversion price, from $4.85 per share of the Companybs common stock to $3.19 per share of the Companybs 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

7,931,000

10,406,000

3,800,000

Number of shares issued for converted payment

1,715,443

Price failure equity condition

$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

Total debt discount being amortized into interest expense

13,100,000

Non-cash interest expense amortization of debt discount

1,100,000

3,900,000

5,900,000

8,400,000

900,000

2,200,000

3,600,000

6,400,000

100,000

200,000

400,000

500,000

Percentage of stock discount

85.00%

Non-cash interest expense issuing stock at discount

1,500,000

1,800,000

1,500,000

Number of trading days for valuation of shares

'10 days

Senior secured term loan

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

Interest expense

1,600,000

4,600,000

7,200,000

10,300,000

1,000,000

1,200,000

Covenant, unrestricted cash balance requirement

15,000,000

Proceeds from issuance of common stock

5,000,000

Repayments of term loan

2,500,000

Combined principal balances of the term loans

10,411,000

20,944,000

10,411,000

20,944,000

10,411,000

14,389,000

15,380,000

24,074,000

25,000,000

7,500,000

Minimum amount of proceeds from specified asset dispositions for mandatory prepayment feature

$1,000,000

Warrants_and_Derivative_Liabil2

Warrants and Derivative Liabilities - Additional Information (Detail) (USD $)

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

1 Months Ended

0 Months Ended

3 Months Ended

0 Months Ended

3 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Oct. 09, 2013

Apr. 04, 2012

Dec. 31, 2013

Dec. 31, 2012

Apr. 04, 2012

Dec. 31, 2013

Dec. 31, 2012

Nov. 15, 2013

Dec. 31, 2013

Nov. 15, 2013

Jun. 05, 2012

Dec. 31, 2013

Convertible Bond

Warrants And Derivative Liability

Maximum

Capital Ventures International

Senior Convertible Debt

New Unsecured Senior Convertible Note

Senior Secured Term Loan

Senior Secured Term Loan b Second Warrant

Capital Ventures International

Maximum

Hercules Technology Growth Capital

Minimum

Maximum

Derivative [Line Items]

Number of shares received from warrants received to purchase common stock

3,094,060

256,410

139,276

Warrant exercise, waiting period

'6 months

Warrant exercise period

'5 years

Exercise price

$2.61

$5.45

$2.59

$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

$535,000

$5,217,000

$1,890,000

$6,114,000

$200,000

$2,300,000

$500,000

$3,300,000

$200,000

$100,000

($1,000,000)

$300,000

$2,700,000

$1,200,000

($2,600,000)

$100,000

Conversion price

$4.85

$3.15

$4.85

$3.19

$4.85

Increase in derivative liability

$500,000

Convertible debt instrument redemption waiting period

'1 year

Convertible debt instrument contractual term

'30 months

Warrants_and_Derivative_Liabil3

Warrants and Derivative Liabilities - Schedule of Assumptions Used to Calculate the Fair Value of Warrants (Detail) (USD $)

0 Months Ended

3 Months Ended

0 Months Ended

3 Months Ended

0 Months Ended

3 Months Ended

0 Months Ended

3 Months Ended

1 Months Ended

0 Months Ended

1 Months Ended

0 Months Ended

In Millions, unless otherwise specified

Apr. 04, 2012

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Apr. 04, 2012

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Jun. 30, 2012

Jun. 05, 2012

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Nov. 15, 2013

Dec. 31, 2013

Dec. 20, 2012

Oct. 09, 2013

Nov. 15, 2013

Dec. 20, 2012

Nov. 15, 2013

Senior Convertible Note Warrant

Senior Secured Term Loan -b First Warrant

Senior Secured Term Loan b Second Warrant

Post Modification

Pre Modification

Senior Convertible Note Warrant

Senior Secured Term Loan -b First Warrant

Derivative [Line Items]

Risk-free interest rate

0.44%

0.12%

0.10%

0.21%

0.20%

0.23%

0.25%

1.19%

1.13%

0.75%

0.77%

1.24%

1.09%

1.20%

0.70%

0.75%

0.64%

0.80%

1.55%

1.89%

0.25%

1.05%

1.00%

0.25%

1.00%

Expected annual dividend yield

15.00%

16.50%

15.50%

16.70%

16.50%

15.00%

16.50%

Expected volatility

75.00%

68.60%

66.30%

65.80%

66.90%

73.50%

70.00%

72.50%

80.00%

71.90%

80.60%

79.99%

74.79%

72.10%

72.30%

72.01%

80.14%

81.18%

80.32%

76.97%

80.37%

72.50%

71.50%

72.64%

72.50%

72.64%

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

'1 year 9 months 15 days

'5 years 6 months

'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 3 months 11 days

'5 years 6 months

'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

'5 years 5 months 27 days

'5 years 4 months 13 days

'1 year 9 months 15 days

'3 years 11 months 27 days

'4 years 18 days

'1 year 9 months 15 days

'4 years 18 days

Fair value

$2.20

$2.50

$3.40

$4.40

$8.60

$0.40

$0.10

$0.20

$0.40

$0.50

$0.30

$3.20

$0.10

Warrants_and_Derivative_Liabil4

Warrants and Derivative Liabilities - Schedule of Fair Value Assumptions Used to Calculate Value of Convertible Note Derivative Feature (Detail) (USD $)	0 Months Ended	3 Months Ended								1 Months Ended
In Thousands, except Per Share data, unless otherwise specified	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. 31, 2013	Dec. 20, 2012	Dec. 20, 2012
	Apr. 04, 2012	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Maximum	Post Modification	Pre Modification
Principal Outstanding	$25,000	$10,411	$10,411	$14,389	$15,380	$20,944	$24,074	$24,074	'	$20,944	$24,074
Stock price	$3.97	$1.64	$2.34	$2.64	$2.67	$2.62	$4.15	$2.95	'	$2.95	$2.95
Percentage volume condition met	85.90%	87.20%	80.20%	87.50%	80.50%	94.50%	51.00%	28.60%	'	94.90%	28.60%
Expected volatility	75.00%	68.60%	66.30%	65.80%	66.90%	73.50%	70.00%	72.50%	'	72.50%	72.50%
Risk free rate	0.44%	0.12%	0.10%	0.21%	0.20%	0.23%	0.23%	0.25%	'	0.25%	0.25%
Bond yield	15.00%	16.50%	15.50%	16.70%	16.50%	16.50%	15.00%	16.50%	'	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	'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	'1 year 9 months 15 days	'	'1 year 9 months 15 days	'1 year 9 months 15 days
Dilution effect	'yes	'yes	'yes	'yes	'yes	'yes	'yes	'yes	'	'yes	'yes
Derivative liability	$3,800	'	$200	$500	$529	$1,000	$2,800	$900	$100	$1,500	$900
Fair value as a percent of par	15.10%	0.02%	0.70%	3.30%	3.40%	4.90%	11.40%	3.90%	'	7.10%	3.90%

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2013	Nov. 15, 2013
Share data in Millions, except Per Share data, unless otherwise specified			MLV & Co. LLC	MLV & Co. LLC
			ATM Arrangement	ATM Arrangement
Stockholders Equity [Line Items]	'	'	'	'
Common stock	$673,000	$603,000	'	$30,000,000
Commission on sale of common stock under the ATM	'	'	'	3.00%
Proceeds from issuance of common stock	'	'	$3,300,000	'
Number of common shares sold	'	'	2.4	'
Sale price of common stock per share	'	'	$1.51	'

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail)

1 Months Ended

0 Months Ended

1 Months Ended

3 Months Ended

9 Months Ended

0 Months Ended

1 Months Ended

3 Months Ended

12 Months Ended

0 Months Ended

Nov. 19, 2013

Jul. 05, 2011

Jun. 17, 2011

12-May-11

Dec. 31, 2013

Mar. 31, 2013

Oct. 17, 2011

Oct. 08, 2011

Sep. 13, 2011

Feb. 27, 2012

Dec. 22, 2011

Dec. 31, 2013

Mar. 31, 2011

Sep. 16, 2011

12-May-11

USD ($)

Claim

USD ($)

Employees

USD ($)

EUR (€)

USD ($)

Sinovel Wind Group Co. Ltd.

Dalian Guotong Electric Co. Ltd.

Ghodawat Energy Pvt Ltd

Bonds

Claim

Bonds

USD ($)

CNY

USD ($)

CNY

USD ($)

CNY

USD ($)

CNY

USD ($)

CNY

USD ($)

CNY

USD ($)

CNY

USD ($)

EUR (€)

Commitments And Contingencies [Line Items]

Adverse purchase commitments

$429,000

$1,440,000

Adjusted accrual for adverse purchase commitments

500,000

1,000,000

Number of putative securities complaints

Number of officers putative securities filed against

Number of complaints additionally asserted claims against the underwriters

Loss contingency

1,800,000

Sought compensation amount

10,000,000

157,000,000

1,000,000,000

58,000,000

370,000,000

17,000,000

105,000,000

190,000,000

1,200,000,000

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

Number of claims consolidated

Fees and expenses for plaintiffs' counsel

475,000

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

1,405,000

6,136,000

Restricted cash

4,901,000

4,820,000

Number of performance bonds in support of customer contracts

Value of performance bond

200,000

Debt instrument maturity date

31-Mar-14

Line of credit outstanding

$3,700,000

€ 2,700,000

Minority_Investments_Additiona

Minority Investments - Additional Information (Detail) (USD $)	9 Months Ended				9 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	20-May-11	Jan. 06, 2011	Oct. 09, 2009	Dec. 31, 2013	Aug. 12, 2010
	Tres Amigas	Tres Amigas	Tres Amigas	Tres Amigas	Blade Dynamics Ltd.	Blade Dynamics Ltd.
				Item
Schedule Of Equity Method Investments [Line Items]	'	'	'	'	'	'
Acquisition date	9-Oct-09	'	'	'	12-Aug-10	'
Number of commonly interconnected power grids	'	'	'	3	'	'
Equity method investment, aggregate cost	'	'	'	$1.80	'	'
Equity method investment in cash	'	'	'	0.8	'	8
Equity method investment in common stock	'	'	'	1	'	'
Cash consideration for increase in minority position	'	$1.80	$1.80	'	'	'
Equity method investment ownership percentage	26.00%	'	'	'	'	'
Cost method investment ownership percentage	'	'	'	'	19.00%	'

Minority_Investments_Schedule_

Minority Investments - Schedule of Net Investment Activity (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Results Related To Equity Accounted Investees [Line Items]	'	'	'	'
Net foreign exchange rate impact	$358	$521	$1,015	($206)
Tres Amigas	'	'	'	'
Schedule Of Results Related To Equity Accounted Investees [Line Items]	'	'	'	'
Beginning balance	'	'	2,853	'
Minority interest in net losses	'	'	-789	'
Ending balance	2,064	'	2,064	'
Blade Dynamics Ltd.	'	'	'	'
Schedule Of Results Related To Equity Accounted Investees [Line Items]	'	'	'	'
Beginning balance	'	'	4,611	'
Ending balance	4,953	'	4,953	'
Net foreign exchange rate impact	'	'	$342	'

Business_Segments_Additional_I

Business Segments - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
	Dec. 31, 2013	Dec. 31, 2012	Segment	Dec. 31, 2012
Segment Reporting [Abstract]	'	'	'	'
Number of reportable business segments	'	'	2	'
Total stock-based compensation expense	$3,040,000	$1,929,000	$7,328,000	$5,968,000
Restructuring and impairment charges	$100,000	$6,700,000	$900,000	$6,800,000

Business_Segments_Operating_Re

Business Segments - Operating Results for Two Business Segments (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]	'	'	'	'
Revenues	$20,563	$17,417	$67,830	$67,000
Operating (loss) income	-6,675	-20,616	-26,552	-41,714
Operating Segments \| Wind	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Revenues	13,545	6,808	42,937	35,321
Operating (loss) income	1,067	-5,365	-3,207	-10,514
Operating Segments \| Grid	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Revenues	7,018	10,609	24,893	31,679
Operating (loss) income	-4,670	-6,705	-15,287	-18,620
Unallocated corporate expenses	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Operating (loss) income	($3,072)	($8,546)	($8,058)	($12,580)

Business_Segments_Total_Busine

Business Segments - Total Business Segments Assets (Detail) (USD $)	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2013	Mar. 31, 2013
Segment Reporting Asset Reconciling Item [Line Items]	'	'
Total assets	$178,371	$216,754
Operating Segments \| Wind	'	'
Segment Reporting Asset Reconciling Item [Line Items]	'	'
Total assets	52,351	67,111
Operating Segments \| Grid	'	'
Segment Reporting Asset Reconciling Item [Line Items]	'	'
Total assets	58,354	72,800
Unallocated corporate expenses	'	'
Segment Reporting Asset Reconciling Item [Line Items]	'	'
Total assets	$67,666	$76,843

Business_Segments_Schedule_of_

Business Segments - Schedule of Revenues by Major Customers (Detail)	3 Months Ended		9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Inox Wind Limited	'	'	'	'
Segment Reporting Asset Reconciling Item [Line Items]	'	'	'	'
Revenue percentage	35.00%	19.00%	25.00%	17.00%
Csr Zhuzhou Institute Company Limited	'	'	'	'
Segment Reporting Asset Reconciling Item [Line Items]	'	'	'	'
Revenue percentage	18.00%	'	'	'
Csr Zhuzhou Institute Company Limited \| Maximum	'	'	'	'
Segment Reporting Asset Reconciling Item [Line Items]	'	'	'	'
Revenue percentage	'	'	10.00%	10.00%
Beijing Jingcheng New Energy Company Limited	'	'	'	'
Segment Reporting Asset Reconciling Item [Line Items]	'	'	'	'
Revenue percentage	'	'	22.00%	17.00%
Beijing Jingcheng New Energy Company Limited \| Maximum	'	'	'	'
Segment Reporting Asset Reconciling Item [Line Items]	'	'	'	'
Revenue percentage	10.00%	10.00%	'	'
Cg Power Solutions United Kingdom Limited	'	'	'	'
Segment Reporting Asset Reconciling Item [Line Items]	'	'	'	'
Revenue percentage	'	21.00%	'	'
Cg Power Solutions United Kingdom Limited \| Maximum	'	'	'	'
Segment Reporting Asset Reconciling Item [Line Items]	'	'	'	'
Revenue percentage	'	'	10.00%	10.00%
Eon Climate And Renewables	'	'	'	'
Segment Reporting Asset Reconciling Item [Line Items]	'	'	'	'
Revenue percentage	'	19.00%	'	'
Eon Climate And Renewables \| Maximum	'	'	'	'
Segment Reporting Asset Reconciling Item [Line Items]	'	'	'	'
Revenue percentage	10.00%	'	10.00%	10.00%