| Cover | Mar. 29, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Amendment Description | March 29, 2023, Avadel Pharmaceuticals plc (the “Company”) filed a Current Report on Form 8-K (the “Original 8-K”) to disclose that (i) the Company and Avadel Finance Cayman Limited, a Cayman Islands exempted company (the “Issuer”) had entered into separate, privately negotiated exchange agreements (the “Exchange Agreements”) with certain holders of its outstanding 4.50% exchangeable senior notes due October 2, 2023 and issued on April 4, 2022 (the “2023 Notes”) pursuant to which the Issuer will exchange approximately $96.2 million in aggregate principal amount of the 2023 Notes for an aggregate principal amount of new 6.00% exchangeable senior notes due April 1, 2027 (the “2027 Notes”) that will be determined pursuant to the terms of the Exchange Agreements (the “Exchange Transactions”) as described in greater detail in the Original 8-K and (ii) that Avadel CNS Pharmaceuticals, LLC, an indirect wholly-owned subsidiary of the Company (“Avadel CNS”), the Company, and each guarantor party thereto, and RTW Royalty II DAC (“RTW”) entered into a Purchase and Sale Agreement (the “Royalty Purchase Agreement”), pursuant to which Avadel CNS sold to RTW the right to receive certain royalty payments from Avadel CNS for a purchase price of up to $75.0 million in cash. |
| Document Period End Date | Mar. 29, 2023 |
| Entity File Number | 001-37977 |
| Entity Registrant Name | AVADEL PHARMACEUTICALS PLC |
| Entity Central Index Key | 0001012477 |
| Entity Tax Identification Number | 98-1341933 |
| Entity Incorporation, State or Country Code | L2 |
| Entity Address, Address Line One | 10 Earlsfort Terrace |
| Entity Address, City or Town | Dublin 2 |
| Entity Address, Country | IE |
| Entity Address, Postal Zip Code | D02 T380 |
| City Area Code | 353 |
| Local Phone Number | 1 901 5201 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | American Depositary Shares* |
| Trading Symbol | AVDL |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
