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Balance Sheet Components - Summary of Property and Equipment, Net (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Property Plant And Equipment [Line Items] |  |
Total property and equipment, gross | $ 19,803 | $ 19,721
Less: accumulated depreciation | (4,493) | (2,883)
Total property and equipment, net | 15,310 | 16,838
Leasehold Improvements [Member] |  |
Property Plant And Equipment [Line Items] |  |
Total property and equipment, gross | 17,246 | 17,231
Laboratory Equipment [Member] |  |
Property Plant And Equipment [Line Items] |  |
Total property and equipment, gross | 1,832 | 1,764
Furniture and Fixtures [Member] |  |
Property Plant And Equipment [Line Items] |  |
Total property and equipment, gross | 692 | 692
Computer Equipment and Software [Member] |  |
Property Plant And Equipment [Line Items] |  |
Total property and equipment, gross | $ 33 | $ 34

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