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Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accrued Liabilities Current [Abstract]    
Payroll and employee-related costs $ 4,126 $ 2,585
Research costs 1,580 996
Licensing fees 651 492
Professional fees 1,281 2,715
Intellectual property costs 731 3,372
Accrued property and equipment   5,081
Other 116 1,079
Total $ 8,485 $ 16,320