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Discontinued Operations - Schedule of Financial Results of Discontinued Operations (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Interest and other, net |  |
Income from discontinued operations, net of tax | $ 105,519 | $ 38,738
FibroGen International [Member] |  |
Revenue: |  |
Product revenue, net | 173,664 | 100,949
Operating costs and expenses: |  |
Cost of goods sold | 21,036 | 14,886
Research and development | 7,375 | 16,388
Selling, general and administrative | 32,304 | 28,769
Total operating costs and expenses | 60,715 | 60,043
Income from operations | 112,949 | 40,906
Interest and other, net |  |
Interest expense | (11,683) | (7,437)
Interest income and other income (expenses), net | 423 | 2,886
Total interest and other, net | (11,260) | (4,551)
Income before income taxes | 101,689 | 36,355
Provision for income taxes | 139 | 255
Investment income in unconsolidated variable interest entity | 3,969 | 2,638
Income from discontinued operations, net of tax | $ 105,519 | $ 38,738

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