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Fair Value Measurements - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Input
Sep. 30, 2014
USD ($)
Dec. 31, 2014
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 $ 1,253 $ 519 $ 1,414 $ 1,612  
Derivative warrant liabilities $ 2,935   $ 2,935   $ 225
Hypothetical change in market price of common shares (in hundredths)     10.00%    
Impact of the hypothetical change in market price of common shares on derivative liability     $ 600