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Other Accrued Liabilities - Summary of Other Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accrued Liabilities Current [Abstract]    
Accrued personnel expenses $ 13,499 $ 8,632
Professional fees 523 295
Other 603 616
Total $ 14,625 $ 9,543