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Share-Based Compensation - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | 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
Unrecognized compensation expense | $ 12,322,000 |  |  |  |
Weighted average period for unrecognized expense (in years) | 3 years 4 months 24 days |  |  |  |
Aggregate intrinsic value of options exercised | $ 1,841,000 | $ 572,000 | $ 0 |  |
Grant date fair value of options granted (in usd per share) | $ 4.63 | $ 1.24 | $ 3.60 |  |
Number of securities called by each warrant (in shares) | 1 |  |  |  |
Stock-based compensation expense | $ 2,999,000 | $ 519,000 | $ 7,852,000 |  |
Warrant |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Aggregate intrinsic value of warrants exercised | $ 0 | $ 0 | $ 0 |  |
Granted (in shares) | 0 | 0 | 0 |  |
Common Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Employee share purchase plan share issuance (in shares) | 49,000 | 54,000 | 25,000 |  |
Free Share Award |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period (in years) |  |  |  | 3 years |
Granted (in shares) | 186,000 |  |  |  |
Weighted average grant fair value of free share awards | $ 7.69 | $ 2.47 | $ 5.87 |  |
Stock Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized (in shares) | 4,122,315,000 |  |  |  |
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) | 257,000 |  |  |  |
Weighted average grant fair value of free share awards | $ 7.09 |  |  |  |
Vesting percentage | 150.00% |  |  |  |
Stock-based compensation expense | $ 2,734,000 |  |  |  |
Performance Shares | Share-based Payment Arrangement, Employee |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Granted (in shares) | 49,000 | 54,000 |  |  |
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% |  |  |  |
2/3 vesting at second anniversary of grant date | Free Share Award, Grants during 2017 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage | 67.00% |  |  |  |
1/3 vesting at third anniversary of grant date | Free Share Award, Grants during 2017 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage | 33.00% |  |  |  |
1/3 vesting at third anniversary of grant date | Free Share Award, Grants beginning 2018 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage | 33.00% |  |  |  |
1/3 vesting at first anniversary of grant date | Free Share Award, Grants beginning 2018 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage | 33.00% |  |  |  |
1/3 vesting at second anniversary of grant date | Free Share Award, Grants beginning 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% |  |  |  |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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