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Supplementary Balance Sheet Information - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Balance Sheet Related Disclosures [Abstract]    
Compensation related accruals $ 3,570 $ 4,029
Accrued clinical trial expense 908 870
Other expenses 2,189 2,766
Total accrued liabilities $ 6,667 $ 7,665