Aggregate number of common shares reserved for future issuance.

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Face amount or stated value per share of common stock.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Percentage of vesting of award under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Purchase price of common stock expressed as a percentage of its fair value.

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Share-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended				48 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2018	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 9,040
Weighted average period for unrecognized expense (in years)	2 years 6 months 14 days
Aggregate intrinsic value of options exercised	$ 877	$ 249
Grant date fair value of options granted (in usd per share)	$ 4.02	$ 5.36
Ordinary shares, nominal value (in usd per share)	0.01	0.01
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant fair value of free share awards (in usd per share)	$ 0	$ 8.20
Granted (in shares)	0
Performance Shares \| Share-based Payment Arrangement, Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	75,000	17,000
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	4 years
Number of shares authorized (in shares)	752,000
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)		1 year	3 years
Expiration period (in years)		10 years	10 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)					3 years
Weighted average grant fair value of free share awards (in usd per share)	$ 0	$ 8.22
Granted (in shares)	0
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
Inducement Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares reserved and available for issuance (in shares)	1,500,000
Shares available for issuance (in shares)	1,278,000
2017 Avadel Employee Share Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance (in shares)	1,000,000
Ordinary shares, nominal value (in usd per share)	$ 0.01
Purchase price of common stock, percentage	85.00%
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 One Year Following Achievement Of Milestones \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 8,027
Vesting percentage	50.00%
Vesting period (in years)	1 year
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 Granted To Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.00%
Vest Upon Achievement Of Certain Corporate Objectives \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	50.00%
Vest One Year Following Achievement Of Certain Corporate Objectives \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	50.00%
Vesting period (in years)	1 year