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Warrants and Derivative Liabilities - Schedule of Fair Value Assumptions Used to Calculate Value of Convertible Note Derivative Feature (Detail) (USD $)	3 Months Ended				9 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014
Combined principal balances of the term loans	$ 10,411,000us-gaap_DebtInstrumentCarryingAmount	$ 10,411,000us-gaap_DebtInstrumentCarryingAmount	$ 14,389,000us-gaap_DebtInstrumentCarryingAmount	$ 15,380,000us-gaap_DebtInstrumentCarryingAmount
Stock price	$ 1.64us-gaap_SharePrice	$ 2.34us-gaap_SharePrice	$ 2.64us-gaap_SharePrice	$ 2.67us-gaap_SharePrice
Percentage volume condition met	87.20%amsc_PercentageVolumeConditionMet	80.20%amsc_PercentageVolumeConditionMet	87.50%amsc_PercentageVolumeConditionMet	80.50%amsc_PercentageVolumeConditionMet
Expected volatility	68.63%us-gaap_FairValueAssumptionsExpectedVolatilityRate	66.26%us-gaap_FairValueAssumptionsExpectedVolatilityRate	65.80%us-gaap_FairValueAssumptionsExpectedVolatilityRate	66.91%us-gaap_FairValueAssumptionsExpectedVolatilityRate
Risk-free interest rate	0.12%us-gaap_FairValueAssumptionsRiskFreeInterestRate	0.10%us-gaap_FairValueAssumptionsRiskFreeInterestRate	0.21%us-gaap_FairValueAssumptionsRiskFreeInterestRate	0.20%us-gaap_FairValueAssumptionsRiskFreeInterestRate
Expected annual dividend yield	16.50%us-gaap_FairValueAssumptionsExpectedDividendRate	15.50%us-gaap_FairValueAssumptionsExpectedDividendRate	16.70%us-gaap_FairValueAssumptionsExpectedDividendRate	16.50%us-gaap_FairValueAssumptionsExpectedDividendRate
Recovery rate	35.00%amsc_FairValueAssumptionsRecoveryRate	35.00%amsc_FairValueAssumptionsRecoveryRate	37.00%amsc_FairValueAssumptionsRecoveryRate	30.00%amsc_FairValueAssumptionsRecoveryRate
Redeemable					yes
Term (years)	9 months	1 year	1 year 3 months 4 days	1 year 6 months 4 days
Dilution effect					yes
Fair value		$ 200,000us-gaap_DerivativeLiabilities	$ 500,000us-gaap_DerivativeLiabilities	$ 500,000us-gaap_DerivativeLiabilities
Fair value as a percent of par	0.02%amsc_ConvertibleNotesFairValueAsPercentageOfParValue	0.70%amsc_ConvertibleNotesFairValueAsPercentageOfParValue	3.30%amsc_ConvertibleNotesFairValueAsPercentageOfParValue	3.40%amsc_ConvertibleNotesFairValueAsPercentageOfParValue

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Convertible notes fair value as percentage of par value.

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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

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Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

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Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Risk-free interest rate assumption used in valuing an instrument.

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