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(Benefit) Expense from Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal-U.S.	$ 660us-gaap_CurrentFederalTaxExpenseBenefit	$ 122us-gaap_CurrentFederalTaxExpenseBenefit	$ 10,265us-gaap_CurrentFederalTaxExpenseBenefit
State-U.S.	117us-gaap_CurrentStateAndLocalTaxExpenseBenefit	118us-gaap_CurrentStateAndLocalTaxExpenseBenefit	2,565us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total Current	777us-gaap_CurrentIncomeTaxExpenseBenefit	240us-gaap_CurrentIncomeTaxExpenseBenefit	12,830us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal-U.S.	(3,689)us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(4,065)us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(2,803)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State-U.S.	(226)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	631us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	(911)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Change in valuation allowance	(3,034)us-gaap_ValuationAllowancesAndReservesPeriodIncreaseDecrease	33,106us-gaap_ValuationAllowancesAndReservesPeriodIncreaseDecrease	22,515us-gaap_ValuationAllowancesAndReservesPeriodIncreaseDecrease
Total Deferred	(3,614)us-gaap_DeferredIncomeTaxExpenseBenefit	(3,434)us-gaap_DeferredIncomeTaxExpenseBenefit	(3,714)us-gaap_DeferredIncomeTaxExpenseBenefit
Benefit from (provision for) income taxes	(2,837)us-gaap_IncomeTaxExpenseBenefit	(3,194)us-gaap_IncomeTaxExpenseBenefit	9,116us-gaap_IncomeTaxExpenseBenefit
Republic of Ireland and the United Kingdom
Deferred:
Ireland and United Kingdom	$ 3,335us-gaap_DeferredForeignIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = amrn_IrelandAndUnitedKingdomMember	$ (33,106)us-gaap_DeferredForeignIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = amrn_IrelandAndUnitedKingdomMember	$ (22,515)us-gaap_DeferredForeignIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = amrn_IrelandAndUnitedKingdomMember

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