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Discontinued Operations - Schedule of Significant Non-cash Items and Capital Expenditures for Discontinued Operations (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Depreciation $ 2,654 $ 9,518
Investment income in unconsolidated variable interest entity (3,969) (2,638)
Dividend received from unconsolidated variable interest entity 2,230 2,255
Stock-based compensation 25,215 50,767
Purchases of property and equipment (266) (2,519)
FibroGen International [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Depreciation 1,458 2,559
Investment income in unconsolidated variable interest entity (3,969) (2,638)
Dividend received from unconsolidated variable interest entity 2,230 2,255
Stock-based compensation 1,770 2,391
Purchases of property and equipment $ (357) $ (859)