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Balance Sheet Components - Schedule of Property and Equipment (Detail) - USD ($) | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Property Plant And Equipment [Line Items] |  |
Property and equipment, gross | $ 0 | $ 117,742,000
Less: accumulated depreciation | 0 | (112,957,000)
Property and equipment, net | 0 | 4,785,000
Leasehold improvements [Member] |  |
Property Plant And Equipment [Line Items] |  |
Property and equipment, gross | 0 | 84,920,000
Laboratory Equipment [Member] |  |
Property Plant And Equipment [Line Items] |  |
Property and equipment, gross | 0 | 20,589,000
Computer Equipment [Member] |  |
Property Plant And Equipment [Line Items] |  |
Property and equipment, gross | 0 | 6,510,000
Furniture and Fixtures [Member] |  |
Property Plant And Equipment [Line Items] |  |
Property and equipment, gross | $ 0 | $ 5,723,000

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