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Discontinued Operations - Schedule of Significant Non-cash Items and Capital Expenditures for Discontinued Operations (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Depreciation | $ 2,654 | $ 9,518
Investment income in unconsolidated variable interest entity | (3,969) | (2,638)
Dividend received from unconsolidated variable interest entity | 2,230 | 2,255
Stock-based compensation | 25,215 | 50,767
Purchases of property and equipment | (266) | (2,519)
FibroGen International [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Depreciation | 1,458 | 2,559
Investment income in unconsolidated variable interest entity | (3,969) | (2,638)
Dividend received from unconsolidated variable interest entity | 2,230 | 2,255
Stock-based compensation | 1,770 | 2,391
Purchases of property and equipment | $ (357) | $ (859)

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