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Basis of Presentation (Details) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Basis of Presentation |  |
Cash, cash equivalents and marketable securities | $ 274,200,000 |
Net Loss | (29,903,000) | (17,332,000)
Net cash used in operations | $ (31,875,000) | $ (17,200,000)

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