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Subsequent Events - Additional Information (Detail)	Mar. 31, 2014 Entity
Subsequent Event [Line Items]
Number of companies contended	5

X

- Definition

Number Of Companies Contending Patents

+ References

No definition available.

+ Details

Name:	amrn_NumberOfCompaniesContendingPatents
Namespace Prefix:	amrn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration