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Fair Value Measurements - Fair Value Measurements Using Significant Unobservable Inputs (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Roll Forward]    
Beginning balance $ 560  
Fair value of warrants issued 18,306 $ 0
Fair value of warrants exercised 0 $ 0
Total change in the liability included in earnings (14,697)  
Ending balance $ 4,169