Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Litigation The Company is subject to potential liabilities generally incidental to our business arising out of present and future lawsuits and claims related to product liability, personal injury, contract, commercial, intellectual property, tax, employment, compliance and other matters that arise in the ordinary course of business. The Company accrues for potential liabilities when it is probable that future costs (including legal fees and expenses) will be incurred and such costs can be reasonably estimated. At June 30, 2020 and December 31, 2019, there were no contingent liabilities with respect to any litigation, arbitration or administrative or other proceeding that are reasonably likely to have a material adverse effect on the Company’s unaudited condensed consolidated financial position, results of operations, cash flows or liquidity. Litigation Related to Noctiva Note 3: Subsidiary Bankruptcy and Deconsolidation briefly describes the Chapter 11 bankruptcy case which our subsidiary Specialty Pharma commenced on February 6, 2019, and which on April 26, 2019 resulted in the bankruptcy court-approved sale of all of Specialty Pharma’s intangible assets and inventory to an unaffiliated third party. As a result of such sale, Specialty Pharma has completed its divestment of the assets of the Noctiva business. During the pendency of the bankruptcy case, all pending litigation against Specialty Pharma is automatically stayed and any new litigation against Specialty Pharma is precluded unless the bankruptcy court orders otherwise. Below are descriptions of a litigation to which Specialty Pharma is a party and a contract dispute involving Specialty Pharma, both of which matters are subject to the automatic stay during the bankruptcy case. Ferring Litigation. Some of the patents covering the Noctiva product (the “Noctiva Patents”) are the subject of litigation initiated by Ferring Pharmaceuticals Inc. and two of its foreign affiliates, Ferring B.V. and Ferring International Center S.A., who manufacture a competing product known as Nocdurna. Nocdurna was approved by the FDA in June 2018 and commercially launched in the U.S. in November 2018. Ferring initiated this litigation initially against Serenity Pharmaceuticals, LLC (the licensor of the Noctiva Patents) and Reprise Biopharmaceutics, LLC (“Reprise”) on April 28, 2017. Avadel subsequently joined the litigation on June 28, 2018, shortly after Ferring received FDA approval for Nocdurna. In this litigation, filed in the United States District Court for the Southern District of New York, Ferring seeks to invalidate and disputes the inventorship of the Noctiva Patents, seeks damages for various alleged breaches of contractual and common law duties, and seeks damages for alleged infringement by Noctiva of Ferring’s “Nocdurna” trademark. Specialty Pharma, Serenity, and Reprise have defended this litigation, and have made counterclaims against Ferring, including for infringement of the Noctiva Patents and a declaratory judgment of noninfringement with respect to Ferring’s “Nocdurna” trademark. The court dismissed Ferring’s inventorship claim and its claims for alleged breaches of contractual and common law duties, although these dismissals may be appealed by Ferring. On February 15, 2019, Specialty Pharma and its co-defendants moved to stay the litigation pending completion of the bankruptcy proceeding of Specialty Pharma. On May 15, 2019, that motion was denied due to a pending settlement of the litigation with respect to just Ferring and Specialty Pharma. On February 25, 2020, Ferring and Specialty Pharma jointly moved for bankruptcy court approval of a settlement agreement with respect to the claims alleged in the litigation. In accordance with the terms of the settlement agreement, promptly following bankruptcy court approval of the settlement agreement, the parties would dismiss with prejudice their respective claims against each other in the litigation. On March 13, 2020, the Bankruptcy Court entered an order approving the settlement with Ferring. Pursuant to the terms of the settlement, the parties were to dismiss their respective claims against each other in the District Court litigation in the Southern District of New York, with such dismissals to be effective concurrently. The joint dismissal was filed with District Court for the Southern District of New York on May 13, 2020 and entered by the Court on May 14, 2020, thus concluding this litigation for Avadel. Contract Dispute. On January 21, 2019, Serenity gave notice to Specialty Pharma of an alleged breach of the parties’ Noctiva license agreement. Serenity alleges that Specialty Pharma breached its contractual obligation to devote commercially reasonable efforts to the commercialization of Noctiva and seeks unspecified damages. On January 27, 2019, Specialty Pharma notified Serenity of a claim for $1.7 million in damages as a result of Serenity’s breach of its contractual obligation to pay the costs of the Ferring Litigation. Serenity’s notice to Specialty Pharma invoked the dispute resolution provisions of the Noctiva license agreement, which culminate in arbitration, but neither party has yet initiated an arbitration proceeding or filed suit. On July 24, 2020, Specialty Pharma sought bankruptcy court approval of a settlement agreement by and between it, Avadel US Holdings, and Serenity. Before the commencement of Specialty Pharma's bankruptcy case, Serenity asserted claims against Specialty Pharma and Avadel US Holdings collectively in an amount no less than $50,000, and after the commencement of the bankruptcy case, Serenity asserted a $3,096 claim against Specialty Pharma and voted to reject its Chapter 11 plan of liquidation. The settlement agreement provides for a global resolution of these disputes by way of an $800 payment from Avadel US Holdings to Serenity, a mutual exchange of general releases, and the withdrawal of Serenity's claim and vote in Specialty Pharma's bankruptcy case. Specialty Pharma's entry into the settlement agreement is subject to approval by the Bankruptcy Court. Exela Litigation. On January 7, 2020, Exela filed a complaint against us and our subsidiary, Avadel Legacy, in the United States District for the District of Delaware. The complaint alleges infringement of a certain Exela patent related to its cysteine hydrochloride product. Exela is most notably seeking i) a declaratory judgment that the Nouress product infringes its patent, ii) an injunction (both preliminary and permanent) precluding the launch of Nouress, and iii) monetary damages (including enhanced damages, prejudgment interest and attorneys’ fees) in the event Nouress is commercially launched and found to infringe Exela’s patent. On July 8, 2020, the parties jointly filed a Stipulation and Proposed Order of Dismissal with the United States District Court for the District of Delaware, and the Court signed and approved that proposed order the same day, thus concluding this litigation for the Avadel entities involved. Material Commitments We have been relieved of all purchase commitments disclosed in Note 16: Contingent Liabilities and Commitments to the Company’s audited consolidated financial statements included in Part II, Item 8 of the Company’s 2019 Annual Report on Form 10-K due to the sale of the hospital business described in Note 4: Disposition of the Hospital Business. There were no other material commitments outside of the normal course of business. Material commitments in the normal course of business include long-term debt obligations which are disclosed in Note 11: Long-Term Debt to the Company’s unaudited condensed consolidated financial statements included in Part I, Item 1 of this report. Our long-term contingent consideration payable as disclosed in Note 10: Contingent Consideration Payable has also been relieved due to the sale of the hospital business. Guarantees Deerfield Guarantee The fair values of our guarantee to Deerfield and the guarantee received by us from Armistice largely offset and when combined are not material. In connection with our February 2018 divestiture of our pediatric assets, we guaranteed to Deerfield the quarterly royalty payment of 15% on net sales of the FSC products through February 6, 2026 (“FSC Product Royalties”), in an aggregate amount of up to approximately $10,300. Given our explicit guarantee to Deerfield, the Company recorded the guarantee in accordance with ASC 460. The balance of this guarantee liability was $1,599 at June 30, 2020. This liability is being amortized proportionately based on undiscounted cash outflows through the remainder of the contract with Deerfield. Armistice Guarantee In connection with our February 2018 divestiture of the pediatric assets, Armistice Capital Master Fund, Ltd., the majority shareholder of Cerecor, guaranteed to us the FSC Product Royalties. The Company recorded the guarantee in accordance with ASC 460. The balance of this guarantee asset was $1,594 at June 30, 2020. This liability is being amortized proportionately based on undiscounted cash outflows through the remainder of the contract with Deerfield. Off-Balance Sheet Arrangements As of June 30, 2020, we did not have any off-balance sheet arrangements, as defined in Item 303(a)(4)(ii) of Regulation S-K.