Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2020	Mar. 04, 2021	Jun. 30, 2020
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	000-28508
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	485-1200
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			$ 466,741,289
Entity Common Stock, Shares Outstanding		58,465,151
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, 2020, are incorporated by reference into Part III of this Form 10-K.
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2020
Amendment Flag	false
Entity Central Index Key	0001012477
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