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Discontinued Operations - Schedule of Significant Non-cash Items and Capital Expenditures for Discontinued Operations (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation	$ 318	$ 810
Investment loss (income) in unconsolidated variable interest entity	554	(589)
Stock-based compensation	2,852	8,762
FibroGen International [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation	318	381
Investment loss (income) in unconsolidated variable interest entity	554	(589)
Stock-based compensation	$ 344	$ 442

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Investment (gain) loss in unconsolidated variable interest entity.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
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Amount of noncash expense for share-based payment arrangement.

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-Section 45
-Paragraph 28
-Subparagraph (a)
-SubTopic 10
-Topic 230
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