XML 90 R56.htm IDEA: XBRL DOCUMENT
v3.22.4

Equity - Incentive Equity Awards - Additional Information (Detail) - shares | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Restricted Stock Units (RSUs) |  |
Stockholders Equity Note [Line Items] |  |
Stock units, Granted | 12,587,000 |
Restricted Stock Units (RSUs) | Stock Incentive Plan 2020 and 2011 |  |
Stockholders Equity Note [Line Items] |  |
Stock units, Granted | 1,597,955 | 218,000
Stock units, Vesting Period | 3 years |
Restricted Stock Units (RSUs) | Stock Incentive Plan 2020 and 2011 | Employees |  |
Stockholders Equity Note [Line Items] |  |
Stock units, Granted | 9,069,500 | 5,497,700
Restricted Stock Units (RSUs) | Stock Incentive Plan 2020 and 2011 | Employees | Maximum |  |
Stockholders Equity Note [Line Items] |  |
Stock units, Vesting Period | 4 years |
Restricted Stock Units (RSUs) | Stock Incentive Plan 2020 and 2011 | Employees | Minimum |  |
Stockholders Equity Note [Line Items] |  |
Stock units, Vesting Period | 3 years |
Stock Options |  |
Stockholders Equity Note [Line Items] |  |
Stock units, Vesting Period | 4 years |
Stock Options | Stock Incentive Plan 2020 and 2011 |  |
Stockholders Equity Note [Line Items] |  |
Stock options, additional granted | 1,973,124 | 278,271
Stock Options | Stock Incentive Plan 2020 and 2011 | Employees |  |
Stockholders Equity Note [Line Items] |  |
Stock options, Granted | 3,065,000 | 4,535,117
Stock units, Vesting Period | 4 years |
Performance-Based RSUs | Stock Incentive Plan 2020 and 2011 | Employees |  |
Stockholders Equity Note [Line Items] |  |
Stock units, Granted | 1,919,500 | 2,008,800

X
- Definition Share based compensation arrangement by share based payment award options additional grants in period. + References No definition available. + Details
Name: | amrn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalGrantsInPeriod
Namespace Prefix: | amrn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stockholders Equity Note [Line Items] + References No definition available. + Details
Name: | amrn_StockholdersEquityNoteLineItems
Namespace Prefix: | amrn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- 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://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
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=amrn_StockIncentivePlanTwentyTwentyAndTwentyElevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_TitleOfIndividualAxis=amrn_EmployeesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=amrn_PerformanceBasedRestrictedStockUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |