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Discontinued Operations - Schedule of Significant Non-cash Items and Capital Expenditures for Discontinued Operations (Detail) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Depreciation | $ 530 | $ 1,582
Investment loss (income) in unconsolidated variable interest entity | (1,108) | (1,766)
Impairment of property and equipment | 2,062 | 0
Stock-based compensation | 4,725 | 17,350
FibroGen International [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Depreciation | 530 | 753
Investment loss (income) in unconsolidated variable interest entity | (1,108) | (1,766)
Impairment of property and equipment | 2,062 | 0
Stock-based compensation | $ 943 | $ 884

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