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Debt - Additional Information (Detail) (USD $)	12 Months Ended			1 Months Ended	3 Months Ended	1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 31, 2012	Mar. 31, 2014	May 31, 2014
Debt Disclosure [Line Items]
Fair value of embedded derivative liability			$ 14,600,000us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability
Gain (Loss) on change in fair value of derivative liability	6,300,000us-gaap_GainLossOnDerivativeInstrumentsNetPretax	3,500,000us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Interest expense	18,575,000us-gaap_InterestExpense	34,179,000us-gaap_InterestExpense	18,091,000us-gaap_InterestExpense
Convertible senior notes, net proceeds			144,316,000us-gaap_ProceedsFromConvertibleDebt
Proceeds allocated to conversion option			99,730,000us-gaap_ProceedsFromDebtNetOfIssuanceCosts
Decrease to additional paid-in capital,representing reacquisition of conversion option in convertible notes	10,100,000us-gaap_AdjustmentsToAdditionalPaidInCapitalOther	(24,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalOther	(103,885,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalOther
Gain on extinguishment of debt	38,034,000us-gaap_GainsLossesOnExtinguishmentOfDebt
Gain (loss) on change in fair value of derivative liability	13,472,000us-gaap_UnrealizedGainLossOnDerivatives	47,710,000us-gaap_UnrealizedGainLossOnDerivatives	(35,344,000)us-gaap_UnrealizedGainLossOnDerivatives
Interest payment on notes	10,033,000us-gaap_InterestPaid	6,090,000us-gaap_InterestPaid	2,713,000us-gaap_InterestPaid
Convertible Debt
Debt Disclosure [Line Items]
Convertible senior notes, discount	3,500,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Gain (loss) on change in fair value of derivative liability	900,000us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Convertible notes, interest expense	9,500,000us-gaap_InterestExpenseDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Interest expense, amortization of discount	4,200,000us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Interest expense, contractual coupon interest accrual	5,300,000us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Accrued interest on convertible note	2,400,000us-gaap_InterestPayableCurrent / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember	2,400,000us-gaap_InterestPayableCurrent / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Convertible Debt | 2012 Notes
Debt Disclosure [Line Items]
Convertible senior notes, principal amount				150,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember		31,300,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Convertible senior notes, stated interest rate				3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Convertible senior notes, due date				2032
Convertible senior notes, net proceeds				144,300,000us-gaap_ProceedsFromConvertibleDebt / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Convertible senior notes, payment start date				Jul. 15, 2012
Convertible senior notes, maturity date				Jan. 15, 2032
Value of shares in excess of principal amount of Notes based on closing price	27,800,000amrn_ExcessPrincipalValueOverFairValue / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Additional interest rate on notes per annum	0.50%amrn_AdditionalPercentageInterestRatePenalty / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Convertible senior notes, repurchase price at option of the issuer				100.00%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Proceeds allocated to conversion option					23,800,000us-gaap_ProceedsFromDebtNetOfIssuanceCosts / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Convertible senior notes, fair value	25,689,000us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember	106,600,000us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember		126,200,000us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Note, estimated remaining life					24 months
Debt discount amortization period	24 months
Carrying value of 2014 notes	31,300,000us-gaap_ConvertibleDebt / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Decrease to additional paid-in capital,representing reacquisition of conversion option in convertible notes	10,100,000us-gaap_AdjustmentsToAdditionalPaidInCapitalOther / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Convertible senior notes, discount	0us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember	700,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Gain on extinguishment of debt	38,000,000us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Convertible Debt | 2012 Notes | American Depository Shares
Debt Disclosure [Line Items]
Convertible senior notes, exchange rate of ADS per $1,000 principal amount of notes	113.4752us-gaap_DebtInstrumentConvertibleConversionRatio1 / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember / us-gaap_StatementClassOfStockAxis = amrn_AmericanDepositorySharesMember
Convertible senior notes, total ADS into which the debt is exchangeable	3,547,916us-gaap_DebtConversionConvertedInstrumentSharesIssued1 / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember / us-gaap_StatementClassOfStockAxis = amrn_AmericanDepositorySharesMember
Convertible Debt | 2012 Notes | Exchanged Debt
Debt Disclosure [Line Items]
Convertible senior notes, principal amount						118,700,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtConversionByUniqueDescriptionAxis = amrn_DebtExchangeMember / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Convertible Debt | 2014 Notes
Debt Disclosure [Line Items]
Fair value of embedded derivative liability	2,600,000us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Convertible senior notes, principal amount						118,700,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Convertible senior notes, stated interest rate						3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Convertible senior notes, due date						2032
Convertible senior notes, payment start date	Jul. 15, 2014
Convertible senior notes, maturity date	Jan. 15, 2032
Value of shares in excess of principal amount of Notes based on closing price	74,000,000amrn_ExcessPrincipalValueOverFairValue / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Convertible senior notes, repurchase price at option of the issuer						100.00%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Convertible senior notes, fair value	75,533,000us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember					90,800,000us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Carrying value of 2014 notes	90,600,000us-gaap_ConvertibleDebt / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Convertible senior notes redemption, end date	Jan. 15, 2032
Convertible senior notes, mandatory exchange in whole or in part if daily VWAP equals or exceeds percentage of exchange price, in any number of VWAP Trading days	30us-gaap_DebtInstrumentConvertibleThresholdTradingDays / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Convertible senior notes, discount	27,900,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember					27,900,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Underwriter's fees and offering costs						2,500,000us-gaap_DebtIssuanceCosts / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Gain (loss) on change in fair value of derivative liability	900,000us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Convertible Debt | 2014 Notes | American Depository Shares
Debt Disclosure [Line Items]
Convertible senior notes, exchange rate of ADS per $1,000 principal amount of notes	384.6154us-gaap_DebtInstrumentConvertibleConversionRatio1 / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember / us-gaap_StatementClassOfStockAxis = amrn_AmericanDepositorySharesMember
Convertible senior notes, total ADS into which the debt is exchangeable	45,666,925us-gaap_DebtConversionConvertedInstrumentSharesIssued1 / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember / us-gaap_StatementClassOfStockAxis = amrn_AmericanDepositorySharesMember
Convertible senior notes, initial exchange price	$ 2.60us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember / us-gaap_StatementClassOfStockAxis = amrn_AmericanDepositorySharesMember
Convertible Debt | 2014 Notes | Minimum
Debt Disclosure [Line Items]
Convertible senior notes, mandatory exchange in whole or in part if daily VWAP equals or exceeds percentage of exchange price	110.00%us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Convertible senior notes, mandatory exchange in whole or in part if daily VWAP equals or exceeds percentage of exchange price, at least number of VWAP Trading days	20 days
Convertible Debt | Finance
Debt Disclosure [Line Items]
Interest payment on notes	5,300,000us-gaap_InterestPaid / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember / us-gaap_SecuritiesFinancingTransactionAxis = amrn_FinanceMember	5,300,000us-gaap_InterestPaid / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember / us-gaap_SecuritiesFinancingTransactionAxis = amrn_FinanceMember
Convertible Debt | Non Cash | 2014 Notes
Debt Disclosure [Line Items]
Convertible senior notes, discount	28,200,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember / us-gaap_StatementScenarioAxis = amrn_NonCashMember
Biopharma Debt
Debt Disclosure [Line Items]
Amount received at the closing of the agreement			100,000,000us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / us-gaap_StatementBusinessSegmentsAxis = amrn_BiopharmaceuticalMember
Maximum repayment of future revenue and receivables	144,400,000us-gaap_OtherCommitment / us-gaap_StatementBusinessSegmentsAxis = amrn_BiopharmaceuticalMember		150,000,000us-gaap_OtherCommitment / us-gaap_StatementBusinessSegmentsAxis = amrn_BiopharmaceuticalMember
Repayment under agreement	4,800,000amrn_GuaranteePayments / us-gaap_StatementBusinessSegmentsAxis = amrn_BiopharmaceuticalMember
Biopharma Debt | February 2015
Debt Disclosure [Line Items]
Future minimum repayment under agreement	1,600,000amrn_FutureMinimumGuaranteePayments / amrn_PeriodAxis = amrn_PeriodOneMember / us-gaap_StatementBusinessSegmentsAxis = amrn_BiopharmaceuticalMember
Biopharma Debt | Second quarter of 2015 and in each of the next three quarters
Debt Disclosure [Line Items]
Future minimum repayment under agreement	10,000,000amrn_FutureMinimumGuaranteePayments / amrn_PeriodAxis = amrn_PeriodTwoMember / us-gaap_StatementBusinessSegmentsAxis = amrn_BiopharmaceuticalMember
Biopharma Debt | Per quarter in each of the next four quarters
Debt Disclosure [Line Items]
Future minimum repayment under agreement	15,000,000amrn_FutureMinimumGuaranteePayments / amrn_PeriodAxis = amrn_PeriodThreeMember / us-gaap_StatementBusinessSegmentsAxis = amrn_BiopharmaceuticalMember
Biopharma Debt | Final Payment
Debt Disclosure [Line Items]
Future minimum repayment under agreement	13,000,000amrn_FutureMinimumGuaranteePayments / amrn_PeriodAxis = amrn_PeriodFourMember / us-gaap_StatementBusinessSegmentsAxis = amrn_BiopharmaceuticalMember
Biopharma Debt | Cash
Debt Disclosure [Line Items]
Interest expense	7,200,000us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = amrn_BiopharmaceuticalMember / us-gaap_StatementScenarioAxis = amrn_ChargesCashMember	11,300,000us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = amrn_BiopharmaceuticalMember / us-gaap_StatementScenarioAxis = amrn_ChargesCashMember
Biopharma Debt | Non Cash
Debt Disclosure [Line Items]
Interest expense	$ 1,900,000us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = amrn_BiopharmaceuticalMember / us-gaap_StatementScenarioAxis = amrn_NonCashMember	$ 2,600,000us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = amrn_BiopharmaceuticalMember / us-gaap_StatementScenarioAxis = amrn_NonCashMember

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