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Balance Sheet Components - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Balance Sheet Related Disclosures [Abstract]    
Accrued research and development $ 8,519 $ 8,569
Accrued personnel costs 2,677 4,760
Accrued professional and consulting fees 444 896
Other 57 136
Total accrued liabilities $ 11,697 $ 14,361