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Fair Value Measurements - Additional Information (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Input
Jun. 30, 2016
USD ($)
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 $ 38,000 $ 1,181,000 $ (1,200,000) $ (491,000)  
Derivative warrant liabilities $ 43,000   $ 43,000   $ 18,751,000