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Nature Of The Business And Operations (Details) (USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 05, 2012 | Apr. 04, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2012 | Mar. 31, 2011 | Mar. 31, 2010
Cash, cash equivalents, and marketable securities |  |  |  | $ 51,600,000 |  |  |  |  |  |  |  | $ 51,600,000 |  |
Net (loss) income |  |  |  | (21,168,000) | (26,271,000) | (51,709,000) | (37,679,000) | (185,135,000) | (18,158,000) | 7,839,000 | 9,170,000 | (136,827,000) | (186,284,000) | 16,248,000
Cash used for operations |  |  |  |  |  |  |  |  |  |  |  | (141,042,000) | (22,821,000) | 40,680,000
Reduction in global workforce, percentage |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |
Number of workforce persons, minimum |  |  |  |  | 400 |  |  |  |  |  |  |  |  |
Adverse purchase commitments for inventory |  |  |  | 25,894,000 |  |  |  | 38,763,000 |  |  |  | 25,894,000 | 38,763,000 |
Change in restricted cash |  |  | 8,500,000 |  |  |  |  |  |  |  |  | 9,093,000 | (247,000) | (1,602,000)
Reduction of adverse purchase commitments liability |  |  | 7,400,000 |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  | 9,000,000 |  |  |  |  |  |  |  |  |  |  |
Convertible debt, carrying value |  | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt, effective interest rate |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |
Borrowed amount | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Unrestricted cash balance, minimum | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in restricted cash |  |  | 8,500,000 |  |  |  |  |  |  |  |  |  |  |
Reduction of adverse purchase commitments liability |  |  | 7,400,000 |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  | $ 9,000,000 |  |  |  |  |  |  |  |  |  |  |

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