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Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Payables and Accruals [Abstract]    
Employee compensation and benefits $ 2,703 $ 1,281
In-process research and development obligation   600
Research and development and professional expenses 3,197 907
Accrued expenses $ 5,900 $ 2,788