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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