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Basis of Presentation - (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Basis of Presentation |  |  |  |
Cash, cash equivalents and marketable securities | $ 154,000 |  | $ 154,000 |
Net Loss | $ (28,566) | $ (31,952) | (62,827) | $ (66,625)
Net cash used in operations |  |  | $ 56,049 | $ 68,732

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