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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Payables And Accruals [Abstract]    
Accrued research and development expenses $ 2,960 $ 1,576
Accrued compensation 3,176 2,967
Accrued professional and consulting services 670 129
Other 39 263
Total accrued expenses $ 6,845 $ 4,935