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Discontinued Operations and Divestiture - Schedule of Significant Non-cash Items and Capital Expenditures for Discontinued Operations (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Aug. 29, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Depreciation |  |  |  | $ 713 | $ 2,312
Investment income in unconsolidated variable interest entity |  |  |  | (2,485) | (2,664)
Gain on divestiture |  |  |  | (52,163) | 0
Impairment of property and equipment |  |  |  | 2,062 | 0
Dividend received from unconsolidated variable interest entity |  |  |  | 3,947 | 2,230
Stock-based compensation |  |  |  | 5,387 | 25,037
FibroGen International [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Depreciation |  |  |  | 713 | 1,117
Investment income in unconsolidated variable interest entity |  |  |  | (2,485) | (2,664)
Gain on divestiture | $ (52,200) | $ (52,163) | $ 0 | (52,163) | 0
Impairment of property and equipment |  |  |  | 2,062 | 0
Dividend received from unconsolidated variable interest entity |  |  |  | 3,947 | 2,230
Stock-based compensation |  |  |  | $ 231 | $ 1,326

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