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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities:      
Net loss $ (48,656)us-gaap_NetIncomeLoss $ (56,258)us-gaap_NetIncomeLoss $ (66,131)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operations:      
Depreciation and amortization 9,554us-gaap_DepreciationAndAmortization 10,615us-gaap_DepreciationAndAmortization 13,054us-gaap_DepreciationAndAmortization
Stock-based compensation expense 5,936us-gaap_ShareBasedCompensation 10,696us-gaap_ShareBasedCompensation 8,138us-gaap_ShareBasedCompensation
Impairment of long-lived and intangible assets 3,464us-gaap_ImpairmentOfLongLivedAssetsHeldForUse 1,265us-gaap_ImpairmentOfLongLivedAssetsHeldForUse 4,984us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Provision for excess and obsolete inventory 1,386us-gaap_InventoryWriteDown 316us-gaap_InventoryWriteDown 2,230us-gaap_InventoryWriteDown
Adverse purchase commitment losses (recoveries), net     (7,768)amsc_LossesRecoveriesOnPurchaseCommitmentsNet
Prepaid VAT reserve   1,426amsc_PrepaidValueAddedTaxReserve  
Loss on minority interest investments 743us-gaap_GainLossOnInvestments 1,008us-gaap_GainLossOnInvestments 2,231us-gaap_GainLossOnInvestments
Change in fair value of derivatives and warrants (3,963)amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants (1,872)amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants (7,556)amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants
Loss on extinguishment of debt   5,197us-gaap_GainsLossesOnExtinguishmentOfDebt  
Reversal of Catlin legal costs (2,220)amsc_ReversalOfLitigationSettlementAmount    
Non-cash interest expense 566us-gaap_AmortizationOfFinancingCostsAndDiscounts 7,713us-gaap_AmortizationOfFinancingCostsAndDiscounts 12,426us-gaap_AmortizationOfFinancingCostsAndDiscounts
Other non-cash items (2,436)us-gaap_OtherNoncashIncomeExpense 1,980us-gaap_OtherNoncashIncomeExpense 3,329us-gaap_OtherNoncashIncomeExpense
Changes in operating asset and liability accounts:      
Accounts receivable (2,677)us-gaap_IncreaseDecreaseInAccountsReceivable 11,379us-gaap_IncreaseDecreaseInAccountsReceivable (751)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventory (1,887)us-gaap_IncreaseDecreaseInInventories 13,043us-gaap_IncreaseDecreaseInInventories (6,457)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets (2,330)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 12,512us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 8,887us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable and accrued expenses 5,579us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (10,861)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (21,864)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Deferred revenue 4,265us-gaap_IncreaseDecreaseInDeferredRevenue (21,426)us-gaap_IncreaseDecreaseInDeferredRevenue 9,977us-gaap_IncreaseDecreaseInDeferredRevenue
Net cash used in operating activities (32,676)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (13,267)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (45,271)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:      
Purchase of property, plant and equipment (737)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (278)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,430)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from the sale of property, plant and equipment 18us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 54us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 136us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Proceeds from the maturity of marketable securities     5,276us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Change in restricted cash 2,248us-gaap_IncreaseDecreaseInRestrictedCash 4,669us-gaap_IncreaseDecreaseInRestrictedCash 3,678us-gaap_IncreaseDecreaseInRestrictedCash
Change in other assets 280us-gaap_PaymentsForProceedsFromOtherInvestingActivities (436)us-gaap_PaymentsForProceedsFromOtherInvestingActivities (307)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash provided by investing activities 1,809us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations 4,009us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations 7,353us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:      
Employee taxes paid related to net settlement of equity awards (401)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation (57)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation (42)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Proceeds from the issuance of debt, net of expenses 1,422us-gaap_ProceedsFromDebtNetOfIssuanceCosts 9,842us-gaap_ProceedsFromDebtNetOfIssuanceCosts 32,895us-gaap_ProceedsFromDebtNetOfIssuanceCosts
Repayment of debt (7,295)us-gaap_RepaymentsOfLongTermDebt (4,615)us-gaap_RepaymentsOfLongTermDebt (1,923)us-gaap_RepaymentsOfLongTermDebt
Proceeds from public equity offering, net 14,933us-gaap_ProceedsFromIssuanceInitialPublicOffering 7,458us-gaap_ProceedsFromIssuanceInitialPublicOffering  
Proceeds from exercise of employee stock options and ESPP 124us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 168us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 291us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Net cash provided by financing activities 8,783us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 12,796us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 31,221us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of exchange rate changes on cash and cash equivalents (540)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 333us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (339)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net (decrease)/increase in cash and cash equivalents (22,624)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 3,871us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (7,036)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year 43,114us-gaap_CashAndCashEquivalentsAtCarryingValue 39,243us-gaap_CashAndCashEquivalentsAtCarryingValue 46,279us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year 20,490us-gaap_CashAndCashEquivalentsAtCarryingValue 43,114us-gaap_CashAndCashEquivalentsAtCarryingValue 39,243us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental schedule of cash flow information:      
Cash paid for income taxes, net of refunds 362us-gaap_IncomeTaxesPaidNet 864us-gaap_IncomeTaxesPaidNet (311)us-gaap_IncomeTaxesPaidNet
Issuance of common stock to settle liabilities 1,715us-gaap_DebtConversionConvertedInstrumentAmount1 24,407us-gaap_DebtConversionConvertedInstrumentAmount1 18,896us-gaap_DebtConversionConvertedInstrumentAmount1
Cash paid for interest $ 1,362us-gaap_InterestPaid $ 990us-gaap_InterestPaid $ 787us-gaap_InterestPaid