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Basis of Presentation (Details) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Basis of Presentation |  |
Cash, cash equivalents and marketable securities | $ 182,400,000 |
Working capital | 166,100,000 |
Term Loan | 10,100,000 |
Net Loss | (17,332,000) | (13,516,000)
Net cash used in operations | $ (17,200,000) | $ (13,553,000)

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