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Discontinued Operations and Divestiture - Schedule of Financial Results of 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
Interest and other, net |  |  |  |  |
Gain on divestiture |  |  |  | $ 52,163 | $ 0
Income from discontinued operations, net of tax |  | $ 213,782 | $ 31,208 | 241,266 | 78,872
FibroGen International [Member] |  |  |  |  |
Revenue: |  |  |  |  |
Product revenue, net |  | 167,179 | 46,210 | 226,651 | 126,391
Operating costs and expenses: |  |  |  |  |
Cost of goods sold |  | 3,761 | 5,371 | 13,454 | 14,820
Research and development |  | 438 | 1,733 | 1,739 | 5,382
Selling, general and administrative |  | 1,311 | 8,191 | 14,849 | 21,666
Total operating costs and expenses |  | 5,510 | 15,295 | 30,042 | 41,868
Income from operations |  | 161,669 | 30,915 | 196,609 | 84,523
Interest and other, net |  |  |  |  |
Interest expense |  | (1,900) | (2,926) | (7,816) | (8,745)
Gain on divestiture | $ 52,200 | 52,163 | 0 | 52,163 | 0
Interest income and other income (expenses), net |  | 475 | 2,330 | (2,173) | 484
Total interest and other, net |  | 50,738 | (596) | 42,174 | (8,261)
Income before income taxes |  | 212,407 | 30,319 | 238,783 | 76,262
Provision for income taxes |  | 0 | 9 | 0 | 54
Investment income in unconsolidated variable interest entity |  | 1,375 | 898 | 2,483 | 2,664
Income from discontinued operations, net of tax |  | $ 213,782 | $ 31,208 | $ 241,266 | $ 78,872

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