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Discontinued Operations - Schedule of Financial Results of Discontinued Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Interest and other, net |  |  |  |
Income from discontinued operations, net of tax | $ 6,080 | $ 31,551 | $ 27,485 | $ 47,664
FibroGen International [Member] |  |  |  |
Revenue: |  |  |  |
Product revenue, net | 19,655 | 49,643 | 59,472 | 80,181
Operating costs and expenses: |  |  |  |
Cost of goods sold | 4,290 | 5,038 | 9,692 | 9,448
Research and development | 542 | 1,746 | 1,301 | 3,650
Selling, general and administrative | 6,074 | 7,370 | 13,538 | 13,475
Total operating costs and expenses | 10,906 | 14,154 | 24,531 | 26,573
Income from operations | 8,749 | 35,489 | 34,941 | 53,608
Interest and other, net |  |  |  |
Interest expense | (2,964) | (2,915) | (5,915) | (5,819)
Interest income and other income (expenses), net | (1,367) | (2,181) | (2,649) | (1,846)
Total interest and other, net | (4,331) | (5,096) | (8,564) | (7,665)
Income before income taxes | 4,418 | 30,393 | 26,377 | 45,943
Provision for income taxes | 0 | 19 | 0 | 45
Investment income in unconsolidated variable interest entity | 1,662 | 1,177 | 1,108 | 1,766
Income from discontinued operations, net of tax | $ 6,080 | $ 31,551 | $ 27,485 | $ 47,664

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