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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Payables And Accruals [Abstract]    
Accounts payable $ 5,369 $ 4,893
Accrued research projects 3,496 6,194
Accrued compensation and benefits 4,125 4,955
Accrued professional fees and other 822 839
Total $ 13,812 $ 16,881