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Fair Value Measurements - Fair Value Measurements Using Significant Unobservable Inputs (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Roll Forward]    
Beginning balance $ 18,751  
Total change in the liability included in earnings (1,238)  
Fair value of warrants issued 0 $ 183
Fair value of warrants exercised 0 $ (245)
Ending balance $ 17,513