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Share-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 26, 2023 | Apr. 03, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation expense | $ 13,962 |  |  |  |  |
Weighted average period for unrecognized expense (in years) | 2 years 6 months |  |  |  |  |
Stock-based compensation expense | $ 15,811 | $ 7,013 | $ 8,872 |  |  |
Aggregate intrinsic value of options exercised | $ 2,612 | $ 877 | $ 249 |  |  |
Grant date fair value of options granted (in usd per share) | $ 9.14 | $ 4.02 | $ 5.36 |  |  |
Ordinary shares, nominal value (in usd per share) | $ 0.01 | $ 0.01 |  |  | $ 0.01 | $ 0.01
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) | 348,000 |  |  |  |  |
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% |  |  |  |  |
Performance Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense | $ 6,996 |  |  |  |  |
Weighted average grant fair value of free share awards (in usd per share) |  |  | $ 8.20 |  |  |
Awards that did not have an accounting grant date (in shares) | 555,000 |  |  |  |  |
Granted (in shares) | 0 | 0 |  |  |  |
Performance Shares | Share-based Payment Arrangement, Employee |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted (in shares) | 47,000 | 75,000 | 17,000 |  |  |
Performance Shares | Vest Upon the Achievement of Certain Regulatory Milestones |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage | 50.00% |  |  |  |  |
Performance Shares | Vest One Year Following Achievement of Milestones |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage | 50.00% |  |  |  |  |
Vesting period (in years) | 1 year |  |  |  |  |
Performance Shares | Vest Upon Achievement of Certain Corporate Objectives |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage | 50.00% |  |  |  |  |
Performance Shares | Vest One Year Following Achievement of Certain Corporate Objectives |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage | 50.00% |  |  |  |  |
Vesting period (in years) | 1 year |  |  |  |  |
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) | 6,883,000 |  |  |  |  |
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 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 |  | $ 8.22 |  |  |
Granted (in shares) | 0 | 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 Granted to Employees | Tranche One |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage | 25.00% |  |  |  |  |
Restricted Share Awards Granted to Employees | Tranche Two |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage | 25.00% |  |  |  |  |
Restricted Share Awards Granted to Employees | Tranche Three |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage | 25.00% |  |  |  |  |
Restricted Share Awards Granted to Employees | Tranche Four |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage | 25.00% |  |  |  |  |

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