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Share-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Feb. 29, 2024 | Jun. 30, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation expense |  |  |  | $ 22,513 |  |
Weighted average period for unrecognized expense (in years) |  |  |  | 2 years |  |
Stock-based compensation expense |  |  |  | $ 20,388 | $ 15,811 | $ 7,013
Aggregate intrinsic value of options exercised |  |  |  | $ 5,781 | $ 2,612 | $ 877
Grant date fair value of options granted (in dollars per share) |  |  |  | $ 11.34 | $ 9.14 | $ 4.02
Ordinary shares, nominal value (in dollars per share) |  |  |  | $ 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) |  |  |  | 2,000,000 |  |
Shares available for issuance (in shares) |  |  |  | 841,000 |  |
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 |  |
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 |  |  |  | $ 8,009 |  |
Granted (in shares) |  |  |  |  |  | $ 0
Awards that did not have an accounting grant date (in shares) |  |  |  |  | 555,000 |
Granted (in shares) |  |  |  | 0 | 0 |
Forfeited (in shares) |  | 185,000 |  |  |  |
Performance Shares | Share-based Payment Arrangement, Employee |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted (in shares) |  |  |  | 113,000 | 47,000 | 75,000
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% |  | 50.00% | 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 |  |
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) |  |  |  | 4,259,000 |  |
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 | 1 year | 1 year
Expiration period (in years) |  |  |  | 10 years | 10 years | 10 years
Stock Option | Board of Directors | Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period (in years) |  |  |  | 1 year |  |
Stock Option | Board of Directors | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period (in years) |  |  |  | 3 years |  |
Restricted Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted average grant fair value of free share awards (in dollars per share) |  |  |  | $ 15.36 |  |
Granted (in shares) |  |  |  | 142,000 | 0 | 0
Forfeited (in shares) |  |  |  | 4,000 |  |
Restricted Share Awards Granted to Employees | Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period (in years) |  |  |  | 1 year |  |
Restricted Share Awards Granted to Employees | Maximum |  |  |  |  |  |
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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