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Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies License Agreements The Company is a party to various agreements, principally relating to licensed technology that requires future payments relating to milestones or royalties on future sales of specified products. During the year ended December 31, 2023, the Company recognized $3.5 million of license revenue during the year ended December 31, 2023 for the first development milestone in the Lexeo License Agreement. See Note 4, Revenue, for additional information. No milestones were achieved during the year ended December 31, 2022 related to any of the Company's agreements. Because achievement of these milestones is not fixed and determinable, such amounts have not been included on the Company’s consolidated statements of operations and comprehensive loss. Legal Proceedings On November 22, 2022, Lyudmila Pazyuk (“Plaintiff”) filed a derivative complaint (Pazyuk v. Machado et al. C.A. No. 2022-1062-MTZ) (the “Action”) in the Delaware Court of Chancery (the “Court”) on behalf of Adverum against Adverum’s nine current directors and four former directors (the “Individual Defendants”). The Action asserts claims against the Individual Defendants for allegedly awarding the Directors excessive compensation. The Individual Defendants have denied, and continue to deny, any and all allegations of wrongdoing or liability asserted in the Action. Nonetheless, solely to eliminate the uncertainty, distraction, disruption, burden, risk and expense of further litigation, the Individual Defendants entered into a Stipulation and Agreement of Settlement, Compromise and Release (the “Stipulation”) on January 24, 2024. Pursuant to the terms of the Stipulation, the Defendants have agreed to implement and maintain certain changes to Adverum’s director compensation policies and practices. If approved by the Court, Adverum will also be responsible for the payment of the plaintiff’s attorneys’ fees of up to $0.6 million. The proposed settlement, as set forth in the Stipulation, is subject to final approval by the Court. If approved, the proposed settlement will (i) fully resolve the Action by dismissing all asserted claims with prejudice and (ii) release all claims related to the allegations in the Action. On January 31, 2024, the Court entered a Scheduling Order With Respect to Notice and Settlement Hearing, which, among other things, set a date of April 9, 2024 to consider the settlement on the terms set forth in the Stipulation.