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Basis of Presentation (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Basis of Presentation |  |  |  |
Cash, cash equivalents and marketable securities | $ 136,600,000 |  | $ 136,600,000 |
Working capital | 123,200,000 |  | 123,200,000 |
Net Loss | (23,140,000) | (15,027,000) | (59,488,000) | (42,316,000)
Net cash used in operations |  |  | $ (52,712,000) | $ (36,456,000)

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