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Balance Sheets Details - Schedule of Accrued Liabilities (Parenthetical) (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Payables and Accruals [Line Items]    
Accrued research and development costs related party $ 39 $ 99
Insurance Premium Financing Agreement [Member]    
Payables and Accruals [Line Items]    
Debt instrument interest rate during period 3.40%