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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Payables And Accruals [Abstract]    
Accounts payable $ 6,483 $ 9,100
Accrued research projects 4,310 6,637
Accrued professional fees 768 635
Accrued compensation and benefits 3,496 3,293
Total $ 15,057 $ 19,665