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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Payables And Accruals [Abstract]    
Employee compensation and benefits $ 972 $ 1,520
Professional fees 770 445
Research and development 2,762 3,051
Other 42 147
Total accrued expenses $ 4,546 $ 5,163