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Accrued Liabilities - Schedule of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Payables And Accruals [Abstract]    
Compensation related accruals $ 3,975 $ 1,165
Accrued clinical trial expense 715 620
Other expenses 3,099 2,352
Warrant liability, current   43
Total accrued liabilities $ 7,789 $ 4,180