Cover page - shares	3 Months Ended
	Mar. 31, 2021	May 05, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity Registrant Name	AVADEL PHARMACEUTICALS PLC
Entity Incorporation, State or Country Code	L2
Entity File Number	000-28508
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	485-1200
Title of 12(b) Security	Ordinary Shares, nominal value $0.01 per share**
No Trading Symbol Flag	true
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Smaller Reporting Company	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		58,487,551
Entity Central Index Key	0001012477
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Amendment Flag	false
NASDAQ/NMS (GLOBAL MARKET) [Member]
Entity Information [Line Items]
Title of 12(b) Security	American Depositary Shares*
Trading Symbol	AVDL
Security Exchange Name	NASDAQ