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Components of Loss from Operations Before Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
United States	$ (7,331)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	$ (9,234)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	$ 1,874us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Loss from operations before taxes	(59,201)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(169,421)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(170,068)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Republic of Ireland and the United Kingdom
Income Taxes [Line Items]
Ireland and United Kingdom	$ (51,870)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign / us-gaap_StatementGeographicalAxis = amrn_IrelandAndUnitedKingdomMember	$ (160,187)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign / us-gaap_StatementGeographicalAxis = amrn_IrelandAndUnitedKingdomMember	$ (171,942)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign / us-gaap_StatementGeographicalAxis = amrn_IrelandAndUnitedKingdomMember

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- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h)(1)(i))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h)(1)(i))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h)(1)(i))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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