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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 |  |  |  |

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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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