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Document And Entity Information - USD ($)
12 Months Ended
Dec. 31, 2018
Mar. 13, 2019
Jun. 29, 2018
Document And Entity Information [Abstract]      
Entity Registrant Name Avadel Pharmaceuticals PLC    
Entity Central Index Key 0001012477    
Current Fiscal Year End Date --12-31    
Entity Filer Category Accelerated Filer    
Trading Symbol AVDL    
Entity Common Stock, Shares Outstanding   37,355,511  
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2018    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2018    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Emerging Growth Company false    
Entity Smaller Reporting Company false    
Entity Shell Company false    
Entity Public Float     $ 221,263,931