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Accrued Liabilities - Schedule of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Payables And Accruals [Abstract]    
Professional fees $ 3,219 $ 1,011
Clinical and contract research organization costs 1,781 30
Travel and entertainment 91 157
Tax liabilities 1,767 2,062
Purchases of property and equipment 4,423 555
Other 1,881 556
Total accrued liabilities $ 13,162 $ 4,371