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Fair Value Measurements - Additional Information (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
Input
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Fair Value Disclosures [Abstract]      
Number of inputs used for valuation of warrants | Input 6    
Derivative warrant liability [Abstract]      
Change in fair value of the warrant liability, net $ 1,672 $ 209  
Derivative warrant liabilities $ 2,051   $ 3,785