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Jurisdictions Subject to Tax Examinations (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2012
Minimum | United States |
Income Taxes [Line Items] |
Tax Years | 2009
Minimum | Ireland |
Income Taxes [Line Items] |
Tax Years | 2007
Minimum | United Kingdom |
Income Taxes [Line Items] |
Tax Years | 2011
Maximum | United States |
Income Taxes [Line Items] |
Tax Years | 2012
Maximum | Ireland |
Income Taxes [Line Items] |
Tax Years | 2012
Maximum | United Kingdom |
Income Taxes [Line Items] |
Tax Years | 2012

X
- Details
Name: | amrn_IncomeTaxesLineItems
Namespace Prefix: | amrn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tax year being audited in the income tax examination, in CCYY format. + References No definition available. + Details
Name: | us-gaap_IncomeTaxExaminationYearUnderExamination
Namespace Prefix: | us-gaap_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration