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Fair Value Measurements - Fair Value Measurements Using Significant Unobservable Inputs (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Roll Forward]    
Balance at December 31, 2015 $ 3,785  
Total change in the liability included in earnings (1,672)  
Fair value of warrants issued 183 $ 820
Fair value of warrants exercised (245) $ 0
Balance at March 31, 2016 $ 2,051