v3.26.1
Discontinued Operations and Divestiture - Schedule of Significant Non-cash Items and Capital Expenditures for Discontinued Operations (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Disposal Group, Including Discontinued Operations [Line Items]    
Depreciation $ 0 $ 530
Investment income in unconsolidated variable interest entity 0 (1,108)
Impairment of property and equipment 0 2,062
Stock-based compensation $ 2,135 4,725
FibroGen International [Member]    
Disposal Group, Including Discontinued Operations [Line Items]    
Depreciation   530
Investment income in unconsolidated variable interest entity   (1,108)
Impairment of property and equipment   2,062
Stock-based compensation   $ 943