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Commitments And Contingencies (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended
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Jun. 17, 2011 claim | May 12, 2011 employee claim | Dec. 31, 2012 USD ($) | Mar. 31, 2012 USD ($) plaintiff | Dec. 31, 2012 USD ($) | May 12, 2011 AMSC Windtec [Member] USD ($) | May 12, 2011 AMSC Windtec [Member] EUR (€) | Sep. 16, 2011 Dalian Guotong Electric Co. Ltd. [Member] USD ($) | Sep. 16, 2011 Dalian Guotong Electric Co. Ltd. [Member] CNY | Dec. 22, 2011 Sinovel Wind Group Co. Ltd. [Member] USD ($) | Dec. 22, 2011 Sinovel Wind Group Co. Ltd. [Member] CNY | Oct. 17, 2011 Sinovel Wind Group Co. Ltd. [Member] USD ($) | Oct. 17, 2011 Sinovel Wind Group Co. Ltd. [Member] CNY | Oct. 08, 2011 Sinovel Wind Group Co. Ltd. [Member] USD ($) | Oct. 08, 2011 Sinovel Wind Group Co. Ltd. [Member] CNY | Sep. 13, 2011 Sinovel Wind Group Co. Ltd. [Member] USD ($) | Sep. 13, 2011 Sinovel Wind Group Co. Ltd. [Member] CNY | Mar. 31, 2011 Sinovel Wind Group Co. Ltd. [Member] USD ($) | Mar. 31, 2011 Sinovel Wind Group Co. Ltd. [Member] CNY | Dec. 31, 2012 Letter Of Credit [Member] USD ($) | Dec. 31, 2012 Purchase Commitment [Member] USD ($) | Dec. 31, 2012 Purchase Commitment [Member] EUR (€)
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adverse purchase commitments |  |  | $ (1,799,000) | $ (25,894,000) | $ (1,799,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrual for adverse purchase commitments |  |  | 10,300,000 |  | 24,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,200,000
Common stock issued to vendor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 765,301 | 765,301
Shortfall payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 |
Borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,000,000 |  | 2,200,000
Letter of credit expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2012
Cash collateral |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,500,000 | 3,000,000 |
Number of vendors filing suits |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential loss, minimum |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential loss, maximum |  |  | 2,000,000 |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of putative securities complaints | 4 | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of officers putative securities filed against |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of complaints additionally asserted claims against the underwriters |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claims consolidated | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monetary damages due to breaches of contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 76,000,000 | 485,000,000 |  |  |
Value of the undelivered components |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 720,000,000 | 4,600,000,000 |  |  |
Claim amount per request for arbitration |  |  |  |  |  | 24,000,000 | 18,000,000 |  |  | 190,000,000 | 1,200,000,000 | 157,000,000 | 1,000,000,000 | 58,000,000 | 370,000,000 |  |  |  |  |  |  |
Net amount of damages claimed |  |  |  |  |  |  |  |  |  | 17,000,000 | 105,000,000 |  |  |  |  |  |  |  |  |  |  |
Damages claimed for unauthorized use of software |  |  |  |  |  |  |  | 200,000 | 1,200,000 |  |  |  |  |  |  | 6,000,000 | 38,000,000 |  |  |  |  |
Monetary damages for trade secret infringement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 453,000,000 | 2,900,000,000 |  |  |  |  |
Counterclaims under License Agreement |  |  |  |  |  | 9,000,000 | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash included in current assets |  |  | 9,154,000 | 12,086,000 | 9,154,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash included in long-term assets |  |  | $ 4,820,000 | $ 2,540,000 | $ 4,820,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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