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Discontinued Operations - Schedule of Significant Non-cash Items and Capital Expenditures for Discontinued Operations (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation	$ 530	$ 1,582
Investment loss (income) in unconsolidated variable interest entity	(1,108)	(1,766)
Impairment of property and equipment	2,062	0
Stock-based compensation	4,725	17,350
FibroGen International [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation	530	753
Investment loss (income) in unconsolidated variable interest entity	(1,108)	(1,766)
Impairment of property and equipment	2,062	0
Stock-based compensation	$ 943	$ 884

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