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FibroGen Cayman Non-Controlling Interests	9 Months Ended
	Sep. 30, 2025
Noncontrolling Interest Items [Abstract]
FibroGen Cayman Non-Controlling Interests	9. FibroGen Cayman Non-Controlling Interests FibroGen International (Cayman) Limited (“FibroGen Cayman”) has 15,836,966 Series A Preference Shares outstanding, including 10,484,260 shares owned by FibroGen Inc. and 5,352,706 shares owned by minority shareholders, and 78,000,000 common shares outstanding owned by FibroGen Inc. In the event of liquidation, dissolution, or winding up of the entity, either voluntary or involuntary, including by means of a merger, the holders of FibroGen Cayman Series A Preference Shares are entitled to be paid an amount equal to their liquidation preference as set forth in the FibroGen Cayman Amended and Restated Memorandum and Articles of Association (the “Articles”). The discontinued operations sold under the Transaction discussed in the above Note 2, Discontinued Operations and Divestiture, consisted substantially all the assets owned by FibroGen Cayman, and therefore triggered liquidation distribution process of FibroGen Cayman based on its Articles. Accordingly, during the three months ended September 30, 2025, the Company distributed a total of $5.4 million to FibroGen Cayman’s minority shareholders ($1.00 for each of the FibroGen Cayman Series A Preference Shares held by the minority shareholders), and correspondingly recorded a reduction to the related nonredeemable non-controlling interests of $7.5 million and an adjustment to additional paid-in capital of $2.1 million, for such distribution. Any further distribution, if applicable, will be paid out on a pro-rata basis to the holders of all common and Series A Preference shares of FibroGen Cayman, and is subject to future adjustments, if any, including additional proceeds received from the holdbacks related to the Transaction, and future costs of FibroGen Cayman.

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- Definition

The entire disclosure for noncontrolling interest in consolidated subsidiaries, which could include the name of the subsidiary, the ownership percentage held by the parent, the ownership percentage held by the noncontrolling owners, the amount of the noncontrolling interest, the location of this amount on the balance sheet (when not reported separately), an explanation of the increase or decrease in the amount of the noncontrolling interest, the noncontrolling interest share of the net Income or Loss of the subsidiary, the location of this amount on the income statement (when not reported separately), the nature of the noncontrolling interest such as background information and terms, the amount of the noncontrolling interest represented by preferred stock, a description of the preferred stock, and the dividend requirements of the preferred stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 810
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/810/tableOfContent

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- References

No definition available.

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