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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2021
Mar. 11, 2022
Jun. 30, 2021
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-37977    
Entity Registrant Name AVADEL PHARMACEUTICALS PLC    
Entity Incorporation, State or Country Code L2    
Entity Tax Identification Number 98-1341933    
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 1    
Local Phone Number 901-5201    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 390,167,685
Entity Common Stock, Shares Outstanding   59,032,237  
Documents Incorporated by Reference Portions of either (a) a definitive proxy statement involving the election of directors or (b) an amendment to this Form 10-K, either of which will be filed within 120 days after December 31, 2021, are incorporated by reference into Part III of this Form 10-K.    
Entity Central Index Key 0001012477    
Amendment Flag false    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
American Depositary Shares      
Entity Information [Line Items]      
Title of 12(b) Security American Depositary Shares*    
Trading Symbol AVDL    
Security Exchange Name NASDAQ    
Ordinary Share, Nominal Value $0.01 Per Share      
Entity Information [Line Items]      
Title of 12(b) Security Ordinary Shares, nominal value $0.01 per share**    
Trading Symbol AVDL    
Security Exchange Name NASDAQ