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Accrued Expenses - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Payables and Accruals [Abstract]      
Professional fees $ 401,000    
Accrued incentive awards 1,100,000 $ 600,000 $ 600,000
Additional professional fees due in accounts payable $ 80,509