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Warrants and Derivative Liabilities - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended
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Nov. 13, 2014 | Nov. 15, 2013 | Jun. 05, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Mar. 02, 2014 | Oct. 09, 2013 | Apr. 04, 2012 | Dec. 31, 2012 | Dec. 19, 2014
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued | 9,100,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |  |  |  |  |  |  |  |  |
Gain (loss) in change of fair value of derivative instruments and warrants |  |  |  | $ 2,288 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants | $ 535 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants | $ 3,048 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants | $ 1,890 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants |  |  |  |  |
Convertible debt instrument redemption waiting period |  |  |  |  |  |  | 1 year |  |  |  |  |
Convertible debt instrument contractual term |  |  |  |  |  |  | 30 months |  |  |  |  |
Warrants expiration date |  | May 15, 2019 | Dec. 05, 2017 |  |  |  |  |  |  |  |  |
Common stock units offered | 9,100,000 us-gaap_CommonUnitIssued |  |  |  |  |  |  |  |  |  |  |
Warrant to purchase one share of common stock | 90.00%amsc_WarrantsToPurchaseOneShareOfCommonStock |  |  |  |  |  |  |  |  |  |  |
Number Of Warrants Issued To Purchase Common Stock | 8,200,000 amsc_NumberOfWarrantsIssuedToPurchaseCommonStock |  |  |  |  |  |  |  |  |  |  |
Shares issued, price per share | $ 1.10 us-gaap_SaleOfStockPricePerShare |  |  | $ 1.10 us-gaap_SaleOfStockPricePerShare |  | $ 1.10 us-gaap_SaleOfStockPricePerShare |  |  |  |  |  |
Convertible Bond |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) in change of fair value of derivative instruments and warrants |  |  |  |  | 200 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_ClassOfWarrantOrRightAxis = amsc_ConvertibleBondMember |  | 500 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_ClassOfWarrantOrRightAxis = amsc_ConvertibleBondMember |  |  |  |  |
Senior Secured Term Loan First Warrant |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) in change of fair value of derivative instruments and warrants |  |  |  | 100 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_ClassOfWarrantOrRightAxis = amsc_SeniorSecuredTermLoanFirstWarrantMember | 100 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_ClassOfWarrantOrRightAxis = amsc_SeniorSecuredTermLoanFirstWarrantMember | 100 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_ClassOfWarrantOrRightAxis = amsc_SeniorSecuredTermLoanFirstWarrantMember | 100 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_ClassOfWarrantOrRightAxis = amsc_SeniorSecuredTermLoanFirstWarrantMember |  |  |  |  |
Hudson Warrant |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) in change of fair value of derivative instruments and warrants |  |  |  | 1,100 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_ClassOfWarrantOrRightAxis = amsc_HudsonWarrantMember |  | 1,100 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_ClassOfWarrantOrRightAxis = amsc_HudsonWarrantMember |  |  |  |  |  |
Capital Ventures International |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercise, waiting period |  |  |  |  |  |  | 6 months |  |  |  |  |
Warrant exercise period |  |  |  |  |  |  | 5 years |  |  |  |  |
Common stock, shares issued |  |  |  | 9,100,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_DebtInstrumentAxis = amsc_CapitalVenturesInternationalMember |  |  |  |  |  |  |  |
Required notification period |  |  |  |  |  |  | 61 days |  |  |  |  |
Gain (loss) in change of fair value of derivative instruments and warrants |  |  |  | 1,000 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_DebtInstrumentAxis = amsc_CapitalVenturesInternationalMember | 300 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_DebtInstrumentAxis = amsc_CapitalVenturesInternationalMember | 1,700 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_DebtInstrumentAxis = amsc_CapitalVenturesInternationalMember | 1,200 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_DebtInstrumentAxis = amsc_CapitalVenturesInternationalMember |  |  |  |  |
Debt conversion, shares issued |  |  |  |  |  |  |  | 6,600,000 us-gaap_DebtConversionConvertedInstrumentSharesIssued1 / us-gaap_DebtInstrumentAxis = amsc_CapitalVenturesInternationalMember |  |  |  |
Senior Convertible Debt | Capital Ventures International |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares received from warrants received to purchase common stock |  |  |  |  |  |  |  |  |  | 3,094,060 amsc_PurchaseCommitmentIssuanceOfWarrantsSharesOfCommonStock / us-gaap_DebtInstrumentAxis = amsc_CapitalVenturesInternationalMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |
Exercise price |  |  |  | $ 2.21 invest_InvestmentWarrantsExercisePrice / us-gaap_DebtInstrumentAxis = amsc_CapitalVenturesInternationalMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |  |  | $ 2.61 invest_InvestmentWarrantsExercisePrice / us-gaap_DebtInstrumentAxis = amsc_CapitalVenturesInternationalMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | $ 5.45 invest_InvestmentWarrantsExercisePrice / us-gaap_DebtInstrumentAxis = amsc_CapitalVenturesInternationalMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |
New Unsecured Senior Convertible Note |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion price |  |  |  |  |  |  |  |  |  | $ 4.85 us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_LongtermDebtTypeAxis = amsc_NewUnsecuredSeniorConvertibleNoteMember | 3.19 us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_LongtermDebtTypeAxis = amsc_NewUnsecuredSeniorConvertibleNoteMember |
Debt conversion, shares issued |  |  |  |  |  |  |  | 6,600,000 us-gaap_DebtConversionConvertedInstrumentSharesIssued1 / us-gaap_LongtermDebtTypeAxis = amsc_NewUnsecuredSeniorConvertibleNoteMember |  |  |  |
New Unsecured Senior Convertible Note | Capital Ventures International | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Beneficial ownership limitation percentage |  |  |  |  |  |  |  |  |  |  | 4.99%amsc_BeneficialOwnershipLimitationPercentage / us-gaap_DebtInstrumentAxis = amsc_CapitalVenturesInternationalMember / us-gaap_LongtermDebtTypeAxis = amsc_NewUnsecuredSeniorConvertibleNoteMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
New Unsecured Senior Convertible Note | Capital Ventures International | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Beneficial ownership limitation percentage |  |  |  |  |  |  |  |  |  |  | 9.99%amsc_BeneficialOwnershipLimitationPercentage / us-gaap_DebtInstrumentAxis = amsc_CapitalVenturesInternationalMember / us-gaap_LongtermDebtTypeAxis = amsc_NewUnsecuredSeniorConvertibleNoteMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Senior Secured Loan |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares received from warrants received to purchase common stock |  | 256,410 amsc_PurchaseCommitmentIssuanceOfWarrantsSharesOfCommonStock / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember |  |  |  |  |  |  |  |  |  |
Exercise price |  | 1.95 invest_InvestmentWarrantsExercisePrice / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember |  |  |  | $ 1.70 invest_InvestmentWarrantsExercisePrice / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember |  |  |  |  |  |
Common stock, shares issued | 9,100,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember |  |  |  |  |  |  |  |  |  |  |
Senior Secured Loan | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) in change of fair value of derivative instruments and warrants |  |  |  | $ 100 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 100 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 200 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 100 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |
Senior Secured Loan | Hercules Technology Growth Capital |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares received from warrants received to purchase common stock |  | 256,410 amsc_PurchaseCommitmentIssuanceOfWarrantsSharesOfCommonStock / us-gaap_DebtInstrumentAxis = amsc_HerculesTechnologyGrowthCapitalMember / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember | 139,276 amsc_PurchaseCommitmentIssuanceOfWarrantsSharesOfCommonStock / us-gaap_DebtInstrumentAxis = amsc_HerculesTechnologyGrowthCapitalMember / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember |  |  |  |  |  |  |  |  | 588,235 amsc_PurchaseCommitmentIssuanceOfWarrantsSharesOfCommonStock / us-gaap_DebtInstrumentAxis = amsc_HerculesTechnologyGrowthCapitalMember / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember
Exercise price |  | 1.95 invest_InvestmentWarrantsExercisePrice / us-gaap_DebtInstrumentAxis = amsc_HerculesTechnologyGrowthCapitalMember / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember | 3.59 invest_InvestmentWarrantsExercisePrice / us-gaap_DebtInstrumentAxis = amsc_HerculesTechnologyGrowthCapitalMember / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember |  | $ 1.95 invest_InvestmentWarrantsExercisePrice / us-gaap_DebtInstrumentAxis = amsc_HerculesTechnologyGrowthCapitalMember / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember | $ 1.70 invest_InvestmentWarrantsExercisePrice / us-gaap_DebtInstrumentAxis = amsc_HerculesTechnologyGrowthCapitalMember / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember |  |  |  |  |  | $ 1.10 invest_InvestmentWarrantsExercisePrice / us-gaap_DebtInstrumentAxis = amsc_HerculesTechnologyGrowthCapitalMember / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember
Common stock, shares issued | 9,100,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_DebtInstrumentAxis = amsc_HerculesTechnologyGrowthCapitalMember / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember |  |  |  |  |  |  |  |  |  |  |

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