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Fair Value Measurements - Fair Value Measurements Using Significant Unobservable Inputs (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Roll Forward]    
Balance at December 31, 2014 $ 225  
Total change in the liability included in earnings (1,414)  
Fair value of warrants issued 4,247  
Fair value of warrants exercised (123) $ (143)
Balance at September 30, 2015 $ 2,935