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Discontinued Operations - Schedule of Significant Non-cash Items and Capital Expenditures for Discontinued Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Depreciation | $ 318 | $ 810
Investment loss (income) in unconsolidated variable interest entity | 554 | (589)
Stock-based compensation | 2,852 | 8,762
FibroGen International [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Depreciation | 318 | 381
Investment loss (income) in unconsolidated variable interest entity | 554 | (589)
Stock-based compensation | $ 344 | $ 442

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