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Fair Value of Financial Instruments - Level 3 (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Warrant and Interest Make-Whole Liability    
Carrying value of the convertible notes $ 7,189 $ 26,947
Face value of the convertible notes 8,500  
Estimated fair value of the convertible notes 22,600  
Significant Unobservable Inputs (Level 3) | Derivative Financial Instruments, Liabilities    
Warrant and Interest Make-Whole Liability    
Balance at the beginning of the period 6,564 12,644
Changes in fair value of derivative liabilities included in earnings (193) (2,809)
Reduction due to conversion of debt to equity (4,865) (3,271)
Cashless exercise of common stock warrants (652)  
Balance at the end of the period $ 854 $ 6,564