Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2020	May 07, 2020
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
Document Type	10-Q
Document Period End Date	Mar. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Current Reporting Status	Yes
Entity Emerging Growth Company	false
Entity Smaller Reporting Company	false
Entity Shell Company	false
Entity Interactive Data Current	Yes
Entity Common Stock, Shares Outstanding		58,129,037