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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Payables And Accruals [Abstract]    
Accounts payable $ 4,765 $ 4,893
Accrued research projects 7,190 6,194
Accrued compensation and benefits 2,336 4,955
Accrued professional fees and other 589 839
Total $ 14,880 $ 16,881