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Fair Value Measurements - Additional Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Input
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Fair Value Disclosures [Abstract]          
Number of inputs used for valuation of warrants | Input     6    
Derivative warrant liability [Abstract]          
Warrant liability fair value adjustment $ 1,181 $ 48 $ (491) $ (161)  
Derivative warrant liabilities $ 31,181   $ 31,181   $ 3,785