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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Payables And Accruals [Abstract]    
Employee compensation and benefits $ 1,649 $ 1,520
Professional fees 1,365 445
Research and development 4,738 3,051
Other 97 147
Total accrued expenses $ 7,849 $ 5,163