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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Payables And Accruals [Abstract]    
Clinical expenses $ 3,511 $ 2,698
Compensation, excluding taxes 1,514 1,598
Professional fees 335 225
Interest on convertible note 274 234
Other 293 486
Total accrued expenses $ 5,927 $ 5,241