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Fair Value of Financial Instruments - Level 3 (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Interest Make-Whole Liability    
Carrying value of the convertible notes $ 4,165 $ 7,085
Face value of the convertible notes 4,600  
Estimated fair value of the convertible notes 21,800  
Significant Unobservable Inputs (Level 3) | Derivative Financial Instruments, Liabilities    
Interest Make-Whole Liability    
Balance at the beginning of the period 854 6,564
Changes in fair value of derivative liabilities included in earnings (448) (193)
Reduction due to conversion of debt to equity (292) (4,865)
Cashless exercise of common stock warrants   (652)
Balance at the end of the period $ 114 $ 854