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Certain Financial Statement Caption Information - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Accrued Liabilities Current [Abstract]    
Accrued payroll and other employee benefits $ 1,104 $ 1,870
Clinical studies 1,081 493
Other accruals 235 307
Preclinical studies 102 72
Accrued interest 71 71
Total accrued expenses $ 2,593 $ 2,813