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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Payables And Accruals [Abstract]    
Employee compensation and benefits $ 1,296 $ 3,314
Professional fees 864 696
Research and development 5,490 3,347
Other 229 173
Total accrued expenses $ 7,879 $ 7,530