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Fair Value Measurements - Fair Value Measurements Using Significant Unobservable Inputs (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Roll Forward]    
Beginning balance $ 560  
Fair value of warrants issued 23,532 $ 0
Fair value of warrants exercised 0 $ (19,000)
Total change in the liability included in earnings (17,209)  
Ending balance $ 6,883