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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Payables And Accruals [Abstract]    
Clinical expenses $ 2,216 $ 2,698
Compensation, excluding taxes 747 1,598
Professional fees 188 225
Interest on convertible note 313 234
Other 157 486
Total accrued expenses $ 3,621 $ 5,241