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Difference between (Benefit) Expense from Income Taxes and Amount Computed by Applying Statutory Income Tax Rate to Income 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]
Benefits from taxes at statutory rate	$ (14,786)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ (42,355)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ (42,517)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Rate differential	9,493us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	18,494us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	13,249us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Change in valuation reserves	(3,034)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	33,106us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	22,515us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Warrant derivative liabilities	(2,706)amrn_IncomeTaxReconciliationDerivativeLiabilities	(11,984)amrn_IncomeTaxReconciliationDerivativeLiabilities	8,904amrn_IncomeTaxReconciliationDerivativeLiabilities
Gain on extinguishment of debt	(9,509)amrn_IncomeTaxReconciliationGainLossOnExtinguishmentOfDebt
Research and development credits	(1,455)us-gaap_IncomeTaxReconciliationTaxCreditsResearch	(2,008)us-gaap_IncomeTaxReconciliationTaxCreditsResearch	(48)us-gaap_IncomeTaxReconciliationTaxCreditsResearch
Tax return to provision adjustments	10,026us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate	125us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate	375us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Cumulative translation adjustment	8,061amrn_IncomeTaxRateReconciliationCumulativeTranslationAdjustmentAmount	(280)amrn_IncomeTaxRateReconciliationCumulativeTranslationAdjustmentAmount
Permanent and other	1,073us-gaap_IncomeTaxReconciliationOtherAdjustments	1,708us-gaap_IncomeTaxReconciliationOtherAdjustments	6,638us-gaap_IncomeTaxReconciliationOtherAdjustments
Benefit from (provision for) income taxes	$ (2,837)us-gaap_IncomeTaxExpenseBenefit	$ (3,194)us-gaap_IncomeTaxExpenseBenefit	$ 9,116us-gaap_IncomeTaxExpenseBenefit

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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