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Certain Financial Statement Caption Information - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Accrued Liabilities Current [Abstract]    
Accrued payroll and other employee benefits $ 1,777 $ 1,870
Clinical studies 906 493
Other accruals 224 307
Non-clinical research 188 72
Accrued interest 69 71
Total accrued expenses $ 3,164 $ 2,813