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Discontinued Operations - Schedule of Financial Results of Discontinued Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Interest and other, net |  |
Income from discontinued operations, net of tax | $ 21,405 | $ 16,113
FibroGen International [Member] |  |
Revenue: |  |
Product revenue, net | 39,818 | 30,538
Operating costs and expenses: |  |
Cost of goods sold | 5,403 | 4,410
Research and development | 759 | 1,903
Selling, general and administrative | 7,464 | 6,106
Total operating costs and expenses | 13,626 | 12,419
Income from operations | 26,192 | 18,119
Interest and other, net |  |
Interest expense | (2,951) | (2,904)
Interest income and other income (expenses), net | (1,282) | 335
Total interest and other, net | (4,233) | (2,569)
Income before income taxes | 21,959 | 15,550
Provision for income taxes | 0 | 26
Investment income (loss) in unconsolidated variable interest entity | (554) | 589
Income from discontinued operations, net of tax | $ 21,405 | $ 16,113

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