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Fair Value of Financial Instruments (Details 3) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Warrant and Interest Make-Whole Liability      
Reduction due to conversion of debt to equity $ 26,019 $ 14,887  
Note Liability      
Carrying value of the convertible notes 8,068   $ 26,947
Amount issued 9,700    
Estimated fair value of the convertible notes 27,300    
Significant Unobservable Inputs (Level 3) | Derivative Financial Instruments, Liabilities      
Warrant and Interest Make-Whole Liability      
Balance at the beginning of the period 6,564    
Changes in fair value of derivative liabilities included in earnings (66)    
Reduction due to conversion of debt to equity (4,690)    
Cashless exercise of common stock warrants (652)    
Balance at the end of the period $ 1,156