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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Payables And Accruals [Abstract]    
Employee compensation and benefits $ 4,198 $ 3,314
Professional fees 755 696
Research and development 10,436 3,347
Other 409 173
Total accrued expenses $ 15,798 $ 7,530