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Fair Value Measurements - Additional Information (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Input
Sep. 30, 2016
USD ($)
Dec. 31, 2016
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 $ (27,000) $ (8,680,000) $ (1,227,000) $ (9,171,000)  
Derivative warrant liabilities $ 16,000   $ 16,000   $ 18,751,000