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Collaboration Agreements | 6 Months Ended
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Jun. 30, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Collaboration Agreements | Research and Development Funding Collaboration Agreement In January 2024, the Company entered into a Collaboration and Development Funding Agreement with an unrelated third party, which obligates the third party to provide up to $75.0 million of funding and collaborate with the Company to conduct a global Phase 2a study of DNL151 in patients with Parkinson’s disease and confirmed pathogenic variants of LRRK2. This arrangement is further described in Note 4, " Acquisition, License Agreement and Research and Development Funding Collaboration Agreement", to the consolidated financial statements in the 2025 Annual Report on Form 10-K. Under this arrangement, the Company received $12.5 million during the three months ended June 30, 2026, resulting in cumulative payments received of $62.5 million as of June 30, 2026. Payments received are recorded as a deferred research and development funding liability and recognized as an offset to research and development expenses as the underlying research and development costs are incurred. The Company recognized an offset to research and development expenses of $7.6 million and $3.8 million for the three months ended June 30, 2026 and 2025, respectively, and $13.6 million and $8.8 million for the six months ended June 30, 2026 and 2025, respectively, in the Condensed Consolidated Statements of Operations and Comprehensive Loss. The Company recorded current deferred research and development funding liabilities of $20.0 million and $21.1 million on the Condensed Consolidated Balance Sheets as of June 30, 2026 and December 31, 2025, respectively. Collaboration Agreements Biogen In October 2020, the Company entered into a Definitive Collaboration and License Agreement (“LRRK2 Agreement”), pursuant to which it granted Biogen a license to co-develop and co-commercialize its small molecule LRRK2 inhibitor program (the “LRRK2 Program”), and a Right of First Negotiation, Option and License Agreement (the “ROFN and Option Agreement”), pursuant to which it granted an option and right of first negotiation to certain of the Company's programs utilizing our TransportVehicle TM ("TV") platform, including its amyloid beta program (collectively the "Biogen Collaboration Agreement"), with Biogen Inc.’s subsidiaries, Biogen MA Inc. (“BIMA”) and Biogen International GmbH (“BIG”) (BIMA and BIG, collectively, “Biogen”). The details of the Biogen Collaboration Agreement, the August 2023 amendment and July 2024 side letter to the ROFN and Option Agreement, and the payments the Company has received, and is entitled to receive, are further described in Note 5, "Collaboration Agreements", to the consolidated financial statements in the 2025 Annual Report on Form 10-K. In May 2026, the Company and Biogen announced topline results from the Phase 2b LUMA study of BIIB122/DNL151 in individuals with early-stage Parkinson’s disease. The LUMA study did not meet its primary or secondary endpoints. Based on these results, the Company and Biogen discontinued further development of BIIB122 in idiopathic Parkinson's disease. The Company continues to independently conduct the Phase 2a BEACON study evaluating the small molecule inhibitor in carriers of a pathogenic LRRK2 variant. The Company has no remaining performance obligations under the Biogen Collaboration Agreement, and therefore no contract liability remained on the Condensed Consolidated Balance Sheets as of June 30, 2026 or December 31, 2025. As of June 30, 2026, the Company had not recorded milestone revenue or product sales under the Biogen Collaboration Agreement. Sanofi In October 2018, the Company entered into a Collaboration and License Agreement ("Sanofi Collaboration Agreement") with Genzyme Corporation, a wholly-owned subsidiary of Sanofi S.A. ("Sanofi"). The details of the Sanofi Collaboration Agreement, the February 2025 side letter, and the payments the Company has received, and is entitled to receive, are further described in Note 5, "Collaboration Agreements", to the consolidated financial statements in the Company's 2025 Annual Report on Form 10-K. The Company has no remaining performance obligations under the Sanofi Collaboration Agreement, and therefore no contract liability remains on the Condensed Consolidated Balance Sheets as of June 30, 2026 or December 31, 2025. Under the Sanofi Collaboration Agreement, the Company is eligible to receive milestone payments totaling up to approximately $495.0 million upon achievement of certain clinical, regulatory and sales milestone events for Peripheral Products, and variable royalties on worldwide net sales. As of June 30, 2026, the Company had earned milestone payments of $100.0 million and had not recorded any product sales under the Sanofi Collaboration Agreement. Takeda In January 2018, the Company entered into a Collaboration and Option Agreement ("Takeda Collaboration Agreement") with Takeda Pharmaceutical Company Limited ("Takeda"). The details of the Takeda Collaboration Agreement are further described in Note 5, "Collaboration Agreements", to the consolidated financial statements in the Company's 2025 Annual Report on Form 10-K. There are no remaining performance obligations or potential payments remaining under the initial Takeda Option and Collaboration Agreement. The opt-in by Takeda on the PTV:PGRN and ATV:TREM2 programs represented two new contracts with a customer for accounting purposes (the "PTV:PGRN Collaboration Agreement" and the "ATV:TREM2 Collaboration Agreement"), both of which became effective in December 2021. The February 2025 ATV:TREM2 discontinuation and the PTV:PGRN Collaboration Agreement are further described in Note 5, "Collaboration Agreements", to the consolidated financial statements in the Company's 2025 Annual Report on Form 10-K. In April 2026, Takeda notified the Company of its decision to terminate the PTV:PGRN collaboration agreement in its entirety. As a result, the Company regained full rights to DNL593 and the related intellectual property portfolio. Subsequent to the effective date of the termination, there are no future milestones, cost, or profit sharing obligations related to this agreement. The Company did not recognize any revenue, gain, asset or other material accounting impact in connection with the termination, other than the final cost-sharing settlement. The final cost-sharing settlement related to the PTV:PGRN Collaboration Agreement is reflected in the cost sharing table below. As of June 30, 2026, the Company had earned an aggregate of $10.0 million in option fee payments and $10.0 million in milestone payments from Takeda under the PTV:PGRN and ATV:TREM2 Collaboration Agreements, and had not recorded any product sales under either agreement. Cost Sharing Payments and Reimbursements Cost sharing payments to collaboration partners recorded as expenses in research and development expenses in the Condensed Consolidated Statements of Operations and Comprehensive Loss, and cost sharing reimbursements from collaboration partners recorded as an offset to expense in research and development expenses in the Condensed Consolidated Statements of Operations and Comprehensive Loss are as follows (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2026 |  | 2025 |  | 2026 |  | 2025
Takeda Collaboration Agreement: |  |  |  |  |  |  |
PTV:PGRN cost sharing (reimbursements) | $ | (1,513) |  |  | $ | (1,439) |  |  | $ | (3,130) |  |  | $ | (2,935) |
ATV:TREM2 cost sharing (reimbursements) | — |  |  | (10) |  |  | — |  |  | (147) |
Total Takeda cost sharing (reimbursements)(1) | (1,513) |  |  | (1,449) |  |  | (3,130) |  |  | (3,082) |
Biogen Collaboration Agreement: LRRK2 cost sharing payments(2) | 2,024 |  |  | 4,229 |  |  | 5,887 |  |  | 8,880 |
Net cost sharing payments (reimbursements) | $ | 511 |  |  | $ | 2,780 |  |  | $ | 2,757 |  |  | $ | 5,798 |
_________________________________ (1)Cost sharing reimbursements of $1.5 million and $1.6 million were recorded as a receivable within prepaid expenses and other current assets on the Condensed Consolidated Balance Sheets as of June 30, 2026 and December 31, 2025, respectively. (2)Cost sharing payments due to Biogen of $2.0 million and $2.8 million were recorded within other accrued costs and current liabilities on the Condensed Consolidated Balance Sheets as of June 30, 2026 and December 31, 2025, respectively.

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- Definition The entire disclosure for collaborative arrangements in which the entity is a participant, including a) information about the nature and purpose of such arrangements; b) its rights and obligations thereunder; c) the accounting policy for collaborative arrangements; and d) the income statement classification and amounts attributable to transactions arising from the collaborative arrangement between participants. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 808 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479402/808-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 808 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479402/808-10-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Topic 808 -Publisher FASB -URI https://asc.fasb.org/808/tableOfContent + Details
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