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Acquisition and Variable Interest Entity - Additional Information (Detail) $ in Thousands, ¥ in Millions			1 Months Ended			9 Months Ended
	Sep. 15, 2020 USD ($)	Sep. 15, 2020 CNY (¥)	Oct. 31, 2020 CNY (¥)	Jul. 31, 2020 USD ($)	Jul. 31, 2020 CNY (¥)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 CNY (¥)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 CNY (¥)
Acquisition And Variable Interest Entity [Line Items]
Cash consideration | $						$ 2,145		$ 0
Cash consideration for exchange of outstanding shares							¥ 7.3
Subsequent Event [Member]
Acquisition And Variable Interest Entity [Line Items]
Cash consideration received			¥ 7.3
AstraZeneca AB [Member]
Acquisition And Variable Interest Entity [Line Items]
Acquisition costs							¥ 2.5
AstraZeneca AB [Member] | Prepaid Expenses and Other Current Assets [Member]
Acquisition And Variable Interest Entity [Line Items]
Receivable						$ 1,400			¥ 9.8
Beijing Falikang Pharmaceutical Co. Ltd [Member]
Acquisition And Variable Interest Entity [Line Items]
Percentage of outstanding shares owned						51.10%	51.10%
Investment						$ 1,500			¥ 10.2
Beijing Kangda Yongfu Pharmaceutical Co., LTD [Member] | FibroGen Beijing [Member]
Acquisition And Variable Interest Entity [Line Items]
Percentage of outstanding shares acquired					100.00%
Cash consideration				$ 2,100	¥ 15.0
Transaction costs					5.0
Acquisition costs				400	¥ 2.5
Beijing Kangda Yongfu Pharmaceutical Co., LTD [Member] | FibroGen Beijing [Member] | Beijing Falikang Pharmaceutical Co. Ltd [Member] | AstraZeneca AB [Member]
Acquisition And Variable Interest Entity [Line Items]
Percentage of outstanding shares sold in exchange for cash consideration	48.90%	48.90%
Cash consideration for exchange of outstanding shares	$ 1,000	¥ 7.3
Percentage of outstanding shares owned	51.10%	51.10%
Beijing Kangda Yongfu Pharmaceutical Co., LTD [Member] | FibroGen Beijing [Member] | Acquired License [Member]
Acquisition And Variable Interest Entity [Line Items]
Entire purchase price | $				$ 2,500

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Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of the entity's equity method investment which has been sold.

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