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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