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Fair Value Measurements - Fair Value Measurements Using Significant Unobservable Inputs (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Roll Forward]    
Beginning balance $ 18,751  
Total change in the liability included in earnings (1,200)  
Extinguishment of convertible note warrant (17,489)  
Fair value of warrants issued 0 $ 28,133
Fair value of warrants exercised (19) $ (245)
Ending balance $ 43