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Assets and Liabilities Measured at Fair Value - Fair Value Measurements Using Significant Unobservable Inputs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Roll Forward]      
Beginning balance $ 225 $ 2,310 $ 3,427
Total change in the fair value of the liability included in earnings (564) (1,942) (2,756)
Fair value of warrants issued 4,247 0 1,857
Fair value of warrants exercised (123) (143) (218)
Ending balance $ 3,785 $ 225 $ 2,310