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Share-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended				48 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Feb. 29, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ordinary shares, nominal value (in usd or euro per share)	$ 0.01	$ 0.01			$ 0.01	$ 0.01
Unrecognized compensation expense	$ 18,429
Weighted average period for unrecognized expense (in years)	3 years 2 months 12 days
Aggregate intrinsic value of options exercised	$ 6,291	$ 1,841	$ 572
Grant date fair value of options granted (in usd per share)	$ 5.36	$ 4.63	$ 1.24
Stock-based compensation expense	$ 8,872	$ 2,999	$ 519
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee share purchase plan share issuance (in shares)	17,000	49,000	54,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)					3 years
Restricted Share Awards Granted To Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	4 years
Restricted Share Awards, Grants Beginning In 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)				3 years
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	1,336,000
Vesting period (in years)	4 years
Expiration period (in years)	10 years
Stock Option \| Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)		3 years
Expiration period (in years)		10 years
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	285,000
Weighted average grant fair value of free share awards	$ 8.20	$ 7.09	$ 0
Vesting percentage	100.00%
Stock-based compensation expense	$ 1,786
Performance Shares \| Share-based Payment Arrangement, Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	17,000	49,000
2017 Avadel Employee Share Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ordinary shares, nominal value (in usd or euro per share)	$ 0.01
Shares available for issuance under ESPP	1,000,000
Purchase price of common stock, percentage	85.00%
Inducement Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved and available for issuance (in shares)	1,500,000
2/3 vesting at second anniversary of grant date \| Restricted Share Awards Granted From 2017-2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	67.00%
1/3 vesting at third anniversary of grant date \| Restricted Share Awards Granted From 2017-2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.00%
1/4 vesting at each anniversary of grant date \| Restricted Share Awards Granted To Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
1/3 vesting at third anniversary of grant date \| Restricted Share Awards, Grants Beginning In 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.00%
Vest One Year Following Achievement Of Milestones \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	1 year
Vesting percentage	50.00%
Vest Upon The Achievement Of Certain Regulatory Milestones \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	50.00%
Vest Upon Achievement Of Certain Corporate Objectives \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	50.00%
Stock-based compensation expense	$ 3,509
Vest One Year Following Achievement Of Certain Corporate Objectives \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	1 year
Vesting percentage	50.00%
Vest Upon Achievement Of Certain Corporate Objectives Being Met And Exceeded \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	150.00%