XML 28 R47.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Warrants And Other Derivatives (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended
--- | --- | --- | --- | ---
Apr. 04, 2012 | Apr. 04, 2012 Maximum [Member] | Apr. 04, 2012 Minimum [Member] | Apr. 04, 2012 Securities Purchase Agreement [Member] | Jun. 30, 2012 Securities Purchase Agreement [Member] | Jun. 30, 2012 Convertible Bond [Member] | Jun. 05, 2012 Loan And Security Agreement [Member] | Jun. 30, 2012 Loan And Security Agreement [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |  |  |  |
Exercise price |  |  |  | $ 5.45 |  |  | $ 3.59 |
Shares warranted to purchase | 3.1 |  |  |  |  |  |  |
Percentage in excess of Maximum Percentage |  | 9.99% | 4.99% |  |  |  |  |
Change in fair value of warrants |  |  |  |  | $ 1.5 | $ 0.8 |  | $ 0.1

X
- Definition Change in fair value of warrants. + References No definition available. + Details
Name: | amsc_ChangeInFairValueOfWarrants
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage in excess of the maximum percentage. + References No definition available. + Details
Name: | amsc_PercentageInExcessOfMaximumPercentage
Namespace Prefix: | amsc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Warrants and derivatives, warrant to purchase common stock. + References No definition available. + Details
Name: | amsc_WarrantsAndDerivativesWarrantToPurchaseCommonStock
Namespace Prefix: | amsc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Exercise price of the warrants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column A + Details
Name: | invest_InvestmentWarrantsExercisePrice
Namespace Prefix: | invest_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueInputsAssetsQuantitativeInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration