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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2025
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Settlement Agreement On October 21, 2025, Avadel CNS entered into a Settlement and License Agreement (the “Settlement Agreement”) with Jazz to resolve the First Complaint, Second Complaint, Third Complaint, Fourth Complaint, Avadel Complaint, Second Avadel Complaint, Third Avadel Complaint, Fourth Avadel Complaint and Fifth Avadel Complaint (collectively, the “Lawsuits”) described in Note 13: Commitments and Contingencies. The Settlement Agreement provides for, among other things, (i) a payment by Jazz of $90,000 (the “Settlement Payment”) to Avadel CNS, which was timely paid, and a waiver by Jazz of its right to receive royalties and/or damages on sales of LUMRYZ through September 30, 2025; (ii) dismissal of the Lawsuits with prejudice, which occurred on October 27, 2025, following the Settlement Payment; (iii) the payment by Avadel CNS to Jazz of royalties with respect to (1) LUMRYZ sold for narcolepsy at a rate of 3.85% of net sales, (2) LUMRYZ for indications (including any indications related to idiopathic hypersomnia) other than cataplexy or excessive daytime sleepiness in patients with narcolepsy at a rate of 10% of net sales, and (3) LUMRYZ sold for other certain indications as set forth in the Settlement Agreement; (iv) a grant by Jazz to Avadel CNS of a worldwide, non-exclusive, perpetual, irrevocable, non-terminable, non-transferrable (except as expressly provided in the Settlement Agreement) royalty-bearing license, without the right to sublicense (except as provided in the Settlement Agreement), to any past, present, or future patents that could be asserted against LUMRYZ for any indication; (v) agreement by Jazz not to challenge the approval or approvability of LUMRYZ; and (vi) a grant by Avadel CNS to Jazz of a worldwide, non-exclusive, perpetual, irrevocable, non-terminable, non-transferrable (except as expressly provided in the Settlement Agreement), royalty-free, fully paid-up covenant not to sue, without the right to sublicense (except as expressly provided in the Settlement Agreement), Avadel CNS’ patents in connection with XYWAV and XYREM. Royalties payable by Avadel CNS under the Settlement Agreement are subject to certain adjustments as set forth therein. The parties have also agreed to, among other things, a customary mutual release of all claims arising out of or relating to the Lawsuits. In settling the Lawsuits, Avadel CNS is not admitting any liability, and entry into the Settlement Agreement does not constitute an admission of liability or fault or an admission regarding the accuracy of any allegation made by the plaintiffs or plaintiffs’ counsel. Pursuant to the Settlement Agreement, the Company reversed approximately $9,500 of estimated royalties previously recorded in cost of products sold up to June 30, 2025 related to Patent No. 11147782, following Jazz’s waiver of its rights to receive royalties and damages on prior sales of LUMRYZ through September 30, 2025. The Company will recognize a gain during the three months ended December 31, 2025 in conjunction with the Settlement Payment received on October 27, 2025, net of approximately $32,700 in legal fees and expenses that were contingent on a monetary settlement.