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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Payables And Accruals [Abstract]    
Accounts payable $ 9,536 $ 4,371
Accrued research projects 7,748 6,079
Accrued professional fees 566 802
Accrued compensation and benefits 2,731 2,370
Total $ 20,581 $ 13,622