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Description Of The Business And Basis Of Presentation (Details) (USD $) | 9 Months Ended | 12 Months Ended |  | 0 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2012 employee | Dec. 31, 2011 | Mar. 31, 2012 | Jun. 05, 2012 Hercules Technology Growth Capital [Member] | Apr. 04, 2012 Capital Ventures International [Member]
Description Of Business [Line Items] |  |  |  |  |
Cash, cash equivalents, marketable securities and restricted cash | $ 42,500,000 |  |  |  |
Reduction in global workforce, percentage | 25.00% |  | 50.00% |  |
Number of workforce persons | 373 |  |  |  |
Cash used for operations | (40,691,000) | (133,274,000) |  |  |
Convertible notes |  |  |  |  | 25,000,000
Percent of senior convertible notes |  |  |  |  | 7.00%
Borrowed amount |  |  |  | $ 10,000,000 |

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