Consolidated Variable Interest Entity - Fortis	12 Months Ended
Dec. 31, 2024
Business Combinations [Abstract]
Consolidated Variable Interest Entity - Fortis	6. Consolidated Variable Interest Entity - Fortis In May 2023 (the “Option Acquisition Date”), the Company entered into an exclusive option agreement to acquire Fortis Therapeutics (“Fortis”) with its novel Phase 1 antibody-drug conjugate, FOR46 (now referred to as “FG-3246”), that targets a novel epitope on CD46 preferentially expressed on certain cancer cells. FG-3246 is in development for the treatment of metastatic castration-resistant prostate cancer with potential applicability in other solid tumors and hematologic malignancies. If FibroGen exercises the option to acquire Fortis, it will pay Fortis an option exercise payment of $80.0 million, and thereafter, legacy Fortis shareholders would be eligible to receive from FibroGen up to $200.0 million in contingent payments associated with the achievement of various regulatory approvals. If FibroGen acquires Fortis, it would also be responsible to pay University of California, San Francisco (“UCSF”), an upstream licensor to Fortis, development milestone fees and a single digit royalty on net sales of therapeutic or diagnostic products arising from the licensing arrangement between Fortis and UCSF. If FibroGen chooses not to acquire Fortis, its exclusive license to FG-3246 would expire. Pursuant to an evaluation agreement entered into with Fortis concurrent with the option agreement (together the “Fortis Agreements”), FibroGen has exclusively licensed FG-3246 and will control and fund future research, development, including a Phase 2 clinical study sponsored by FibroGen, and manufacturing of FG-3246 during the up-to four-year option period (which ends on the earlier of 120 days after Fortis or FibroGen submits data from any Phase 2 clinical trial of a product to the U.S. Food and Drug Administration for the purpose of progressing to a Phase 3 clinical trial or May 2027 absent extension). As part of the clinical development strategy, FibroGen will continue the work to develop a PET-based biomarker utilizing a radiolabeled version of the targeting antibody for patient selection. Additionally, the Company is obligated to make four quarterly payments totaling $5.4 million to Fortis in support of its continued development obligations, of which the last payment was $1.7 million and made during the three months ended March 31, 2024. Pursuant to the guidance under ASC 810, the Company determined that Fortis is a VIE and that the Company is the primary beneficiary of Fortis, as through the Fortis Agreements the Company has the power to direct activities that most significantly impact the economic performance of Fortis. Therefore, the Company consolidated Fortis starting from the Option Acquisition Date, and continues to consolidate as of December 31, 2024. The transaction was accounted for as an asset acquisition under ASC 805, Business Combinations, as substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable IPR&D asset. The fair value of the consideration transferred was zero. The Company determined that the above mentioned quarterly payments to support Fortis’ continued development obligations should not be included in the purchase consideration, as those payments are payable to Fortis rather than to its shareholders. Fortis has authorized and issued common shares and Series A preferred shares. As of the Option Acquisition Date and December 31, 2023, the Company owned approximately 2% of Fortis’ Series A preferred shares, which was acquired previously and carried at zero cost. The NCI attributable to the common shares is classified as nonredeemable NCI, as it is 100% owned by third party shareholders. The NCI attributable to the approximately 98% of Series A preferred shares owned by other investors are classified as redeemable NCI in temporary equity, as the preferred shares are redeemable by the non-controlling shares holders upon occurrence of certain events out of the Company’s control. Subsequent to the Option Acquisition Date, Fortis’ net income is allocated to its common shares and preferred shares based on their respective stated rights. Fortis’ net loss is allocated to its common shares only as the holders of preferred shares do not have a contractual obligation to absorb such losses. The Company expensed fair value of the acquired IPR&D assets of $24.4 million as research and development expense in the consolidated statements of operations for the year ended December 31, 2023. The fair value of Fortis (enterprise value) and the fair value of nonredeemable NCI and redeemable NCI were determined based on the above-mentioned option exercise payment of $80.0 million and contingent payments up to $200.0 million, weighted with probability and expected timing of the underlying events, and discounted by the Company’s estimated market level cost of debt. As of December 31, 2024 and 2023, total assets and liabilities of Fortis were immaterial. For the year ended December 31, 2024 and the period from the Option Acquisition Date to December 31, 2023, Fortis’ net income (losses) was immaterial.

Consolidated Variable Interest Entity - Fortis

12 Months Ended

Dec. 31, 2024

Consolidated Variable Interest Entity - Fortis

6. Consolidated Variable Interest Entity - Fortis

In May 2023 (the “Option Acquisition Date”), the Company entered into an exclusive option agreement to acquire Fortis Therapeutics (“Fortis”) with its novel Phase 1 antibody-drug conjugate, FOR46 (now referred to as “FG-3246”), that targets a novel epitope on CD46 preferentially expressed on certain cancer cells. FG-3246 is in development for the treatment of metastatic castration-resistant prostate cancer with potential applicability in other solid tumors and hematologic malignancies. If FibroGen exercises the option to acquire Fortis, it will pay Fortis an option exercise payment of $80.0 million, and thereafter, legacy Fortis shareholders would be eligible to receive from FibroGen up to $200.0 million in contingent payments associated with the achievement of various regulatory approvals. If FibroGen acquires Fortis, it would also be responsible to pay University of California, San Francisco (“UCSF”), an upstream licensor to Fortis, development milestone fees and a single digit royalty on net sales of therapeutic or diagnostic products arising from the licensing arrangement between Fortis and UCSF. If FibroGen chooses not to acquire Fortis, its exclusive license to FG-3246 would expire.

Pursuant to an evaluation agreement entered into with Fortis concurrent with the option agreement (together the “Fortis Agreements”), FibroGen has exclusively licensed FG-3246 and will control and fund future research, development, including a Phase 2 clinical study sponsored by FibroGen, and manufacturing of FG-3246 during the up-to four-year option period (which ends on the earlier of 120 days after Fortis or FibroGen submits data from any Phase 2 clinical trial of a product to the U.S. Food and Drug Administration for the purpose of progressing to a Phase 3 clinical trial or May 2027 absent extension). As part of the clinical development strategy, FibroGen will continue the work to develop a PET-based biomarker utilizing a radiolabeled version of the targeting antibody for patient selection. Additionally, the Company is obligated to make four quarterly payments totaling $5.4 million to Fortis in support of its continued development obligations, of which the last payment was $1.7 million and made during the three months ended March 31, 2024.

Pursuant to the guidance under ASC 810, the Company determined that Fortis is a VIE and that the Company is the primary beneficiary of Fortis, as through the Fortis Agreements the Company has the power to direct activities that most significantly impact the economic performance of Fortis. Therefore, the Company consolidated Fortis starting from the Option Acquisition Date, and continues to consolidate as of December 31, 2024.

The transaction was accounted for as an asset acquisition under ASC 805, Business Combinations, as substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable IPR&D asset. The fair value of the consideration transferred was zero. The Company determined that the above mentioned quarterly payments to support Fortis’ continued development obligations should not be included in the purchase consideration, as those payments are payable to Fortis rather than to its shareholders.

Fortis has authorized and issued common shares and Series A preferred shares. As of the Option Acquisition Date and December 31, 2023, the Company owned approximately 2% of Fortis’ Series A preferred shares, which was acquired previously and carried at zero cost. The NCI attributable to the common shares is classified as nonredeemable NCI, as it is 100% owned by third party shareholders. The NCI attributable to the approximately 98% of Series A preferred shares owned by other investors are classified as redeemable NCI in temporary equity, as the preferred shares are redeemable by the non-controlling shares holders upon occurrence of certain events out of the Company’s control.

Subsequent to the Option Acquisition Date, Fortis’ net income is allocated to its common shares and preferred shares based on their respective stated rights. Fortis’ net loss is allocated to its common shares only as the holders of preferred shares do not have a contractual obligation to absorb such losses.

The Company expensed fair value of the acquired IPR&D assets of $24.4 million as research and development expense in the consolidated statements of operations for the year ended December 31, 2023. The fair value of Fortis (enterprise value) and the fair value of nonredeemable NCI and redeemable NCI were determined based on the above-mentioned option exercise payment of $80.0 million and contingent payments up to $200.0 million, weighted with probability and expected timing of the underlying events, and discounted by the Company’s estimated market level cost of debt.

As of December 31, 2024 and 2023, total assets and liabilities of Fortis were immaterial. For the year ended December 31, 2024 and the period from the Option Acquisition Date to December 31, 2023, Fortis’ net income (losses) was immaterial.