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Basis of Presentation (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Basis of Presentation |  |  |  |
Cash, cash equivalents and marketable securities | $ 155,000,000 |  | $ 155,000,000 |
Working capital | 143,900,000 |  | 143,900,000 |
Net Loss | (19,016,000) | (13,773,000) | (36,348,000) | (27,289,000)
Net cash used in operations |  |  | $ (35,258,000) | $ (25,512,000)

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