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Accrued and Other Current Liabilities - Schedule of Accrued and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Payables And Accruals [Abstract]    
Research and development services $ 1,294 $ 231
General and administrative services 160 297
Compensation expense 2,445 1,522
Other 38 177
Accrued and other current liabilities $ 3,937 $ 2,227