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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