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Equity method investment - Variable Interest Entity - Additional Information (Detail) - Beijing Falikang Pharmaceutical Co Ltd $ in Millions	3 Months Ended
	Sep. 30, 2023 USD ($)
Acquisition And Variable Interest Entity [Line Items]
Dividend received	$ 2.3
Beijing Kangda Yongfu Pharmaceutical Co., LTD [Member] | FibroGen Beijing [Member] | AstraZenecaAB [Member]
Acquisition And Variable Interest Entity [Line Items]
Percentage of outstanding shares acquired	51.10%

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-Name Accounting Standards Codification
-Topic 805
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-Section 50
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