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Summary of Significant Accounting Policies - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Warrant Liability [Member]    
Liabilities:    
Liabilities, fair value $ 13,197  
Money Market Funds [Member]    
Assets:    
Assets, fair value 30,318 $ 25,764
Quoted Prices in Active Markets (Level 1) [Member] | Money Market Funds [Member]    
Assets:    
Assets, fair value 30,318 $ 25,764
Significant Unobservable Inputs (Level 3) [Member] | Warrant Liability [Member]    
Liabilities:    
Liabilities, fair value $ 13,197