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Commitments and Contingencies - Additional Information (Detail) $ in Thousands	Dec. 31, 2024 USD ($)	Dec. 31, 2024 GBP (£)	Jun. 30, 2024 USD ($)
Commitments And Contingencies Disclosure [Line Items]
Additional future contractual purchase obligations without consideration	$ 63,600
Triggering obligations amount			$ 15,800
Accured estimated liability	7,800
Regulatory Approval in Europe
Commitments And Contingencies Disclosure [Line Items]
Future contractual purchase obligations without consideration	160,800
Further Indication for AMR101 | Potential Marketing Approval 1
Commitments And Contingencies Disclosure [Line Items]
Aggregate stock or cash payment upon potential market approval	6,300	£ 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	$ 6,300	£ 5,000,000

X

- Definition

Accured estimated liability.

+ References

No definition available.

+ Details

Name:	amrn_AccuredEstimatedLiability
Namespace Prefix:	amrn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Commitments and contingencies disclosure.

+ References

No definition available.

+ Details

Name:	amrn_CommitmentsAndContingenciesDisclosureLineItems
Namespace Prefix:	amrn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum triggering obligations amount.

+ References

No definition available.

+ Details

Name:	amrn_MaximumTriggeringObligationsAmount
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

Name:	us-gaap_RecordedUnconditionalPurchaseObligation
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:

X

- Details

Name:	srt_StatementScenarioAxis=amrn_FurtherIndicationForAMROneZeroOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	amrn_BusinessDevelopmentsAxis=amrn_PotentialMarketingApprovalOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: