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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% |  |  |  |  |

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