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Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Payables And Accruals [Abstract]    
Payroll related $ 2,116 $ 2,906
Professional fees 427 306
Research and development 1,322 1,585
Other 163 196
Total accrued expenses $ 4,028 $ 4,993