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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Accrued Liabilities    
Accrued compensation $ 1,968 $ 2,086
Accrued professional fees and other 1,860 1,477
Total accrued liabilities $ 3,828 $ 3,563