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Intangible Asset - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2013
Intangible Assets Disclosure [Line Items]
Intangible assets estimated remaining useful life	16 years 9 months 18 days

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- Details

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

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration