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Commitments and Contingencies - Additional Information (Detail) - Sep. 30, 2023 $ in Millions | USD ($) | GBP (£)
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Commitments And Contingencies Disclosure [Line Items] |  |
Future contractual purchase obligations without consideration | $ 59.0 |
Accured estimated liability | 8.0 |
Additional estimated liability | 7.8 |
Regulatory Approval in Europe |  |
Commitments And Contingencies Disclosure [Line Items] |  |
Additional future contractual purchase obligations without consideration | 42.5 |
Maximum |  |
Commitments And Contingencies Disclosure [Line Items] |  |
Estimated liability | 15.8 |
Minimum |  |
Commitments And Contingencies Disclosure [Line Items] |  |
Estimated liability | 8.0 |
Further Indication for AMR101 | Potential Marketing Approval 1 |  |
Commitments And Contingencies Disclosure [Line Items] |  |
Aggregate stock or cash payment upon potential market approval | 6.1 | £ 5,000,000
Further Indication for AMR101 | Potential Marketing Approval 2 |  |
Commitments And Contingencies Disclosure [Line Items] |  |
Aggregate stock or cash payment upon potential market approval | $ 6.1 | £ 5,000,000

X
- Definition Accured estimated liability. + References No definition available. + Details
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Namespace Prefix: | amrn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Additional estimated liability. + References No definition available. + Details
Name: | amrn_AdditionalEstimatedLiability
Namespace Prefix: | amrn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Commitments and contingencies disclosure. + References No definition available. + Details
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Namespace Prefix: | amrn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Estimated liability. + References No definition available. + Details
Name: | amrn_EstimatedLiability
Namespace Prefix: | amrn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Potential milestone payment upon marketing approval. + References No definition available. + Details
Name: | amrn_PotentialMilestonePaymentUponMarketingApproval
Namespace Prefix: | amrn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
Name: | us-gaap_PurchaseObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of the recorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 440 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482648/440-10-50-6 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | amrn_BusinessDevelopmentsAxis=amrn_RegulatoryApprovalInEuropeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |