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Development, Commercialization and Supply Agreement - Changes in Balances of Contract Assets and Liabilities (Parenthetical) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
License And Collaboration Agreements [Line Items]
Deferred revenue, Deductions	$ 445

X

- Definition

License And Collaboration Agreements [Line Items]

+ References

No definition available.

+ Details

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

X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-8

+ Details

Name:	us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration