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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 |  |  | $ 14,600,000 us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability |  |  |
Gain (Loss) on change in fair value of derivative liability | 6,300,000 us-gaap_GainLossOnDerivativeInstrumentsNetPretax | 3,500,000 us-gaap_GainLossOnDerivativeInstrumentsNetPretax |  |  |  |
Interest expense | 18,575,000 us-gaap_InterestExpense | 34,179,000 us-gaap_InterestExpense | 18,091,000 us-gaap_InterestExpense |  |  |
Convertible senior notes, net proceeds |  |  | 144,316,000 us-gaap_ProceedsFromConvertibleDebt |  |  |
Proceeds allocated to conversion option |  |  | 99,730,000 us-gaap_ProceedsFromDebtNetOfIssuanceCosts |  |  |
Decrease to additional paid-in capital,representing reacquisition of conversion option in convertible notes | 10,100,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalOther | (24,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalOther | (103,885,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalOther |  |  |
Gain on extinguishment of debt | 38,034,000 us-gaap_GainsLossesOnExtinguishmentOfDebt |  |  |  |  |
Gain (loss) on change in fair value of derivative liability | 13,472,000 us-gaap_UnrealizedGainLossOnDerivatives | 47,710,000 us-gaap_UnrealizedGainLossOnDerivatives | (35,344,000)us-gaap_UnrealizedGainLossOnDerivatives |  |  |
Interest payment on notes | 10,033,000 us-gaap_InterestPaid | 6,090,000 us-gaap_InterestPaid | 2,713,000 us-gaap_InterestPaid |  |  |
Convertible Debt |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |
Convertible senior notes, discount | 3,500,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |  |  |
Gain (loss) on change in fair value of derivative liability | 900,000 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |  |  |
Convertible notes, interest expense | 9,500,000 us-gaap_InterestExpenseDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |  |  |
Interest expense, amortization of discount | 4,200,000 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |  |  |
Interest expense, contractual coupon interest accrual | 5,300,000 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |  |  |
Accrued interest on convertible note | 2,400,000 us-gaap_InterestPayableCurrent / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 2,400,000 us-gaap_InterestPayableCurrent / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |  |
Convertible Debt | 2012 Notes |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |
Convertible senior notes, principal amount |  |  |  | 150,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  | 31,300,000 us-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 |  |  |  | 144,300,000 us-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 | 27,800,000 amrn_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 |  |  |  |  | 23,800,000 us-gaap_ProceedsFromDebtNetOfIssuanceCosts / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |
Convertible senior notes, fair value | 25,689,000 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 106,600,000 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  | 126,200,000 us-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 | 31,300,000 us-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 | 10,100,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalOther / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |  |  |
Convertible senior notes, discount | 0 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 700,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |  |
Gain on extinguishment of debt | 38,000,000 us-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 | 113.4752 us-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 | 3,547,916 us-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 |  |  |  |  |  | 118,700,000 us-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 | 2,600,000 us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |  |  |
Convertible senior notes, principal amount |  |  |  |  |  | 118,700,000 us-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 | 74,000,000 amrn_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 | 75,533,000 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |  |  | 90,800,000 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Carrying value of 2014 notes | 90,600,000 us-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 | 30 us-gaap_DebtInstrumentConvertibleThresholdTradingDays / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |  |  |
Convertible senior notes, discount | 27,900,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |  |  | 27,900,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Underwriter's fees and offering costs |  |  |  |  |  | 2,500,000 us-gaap_DebtIssuanceCosts / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Gain (loss) on change in fair value of derivative liability | 900,000 us-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 | 384.6154 us-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 | 45,666,925 us-gaap_DebtConversionConvertedInstrumentSharesIssued1 / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember / us-gaap_StatementClassOfStockAxis = amrn_AmericanDepositorySharesMember |  |  |  |  |
Convertible senior notes, initial exchange price | $ 2.60 us-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 | 5,300,000 us-gaap_InterestPaid / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember / us-gaap_SecuritiesFinancingTransactionAxis = amrn_FinanceMember | 5,300,000 us-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 | 28,200,000 us-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 |  |  | 100,000,000 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / us-gaap_StatementBusinessSegmentsAxis = amrn_BiopharmaceuticalMember |  |  |
Maximum repayment of future revenue and receivables | 144,400,000 us-gaap_OtherCommitment / us-gaap_StatementBusinessSegmentsAxis = amrn_BiopharmaceuticalMember |  | 150,000,000 us-gaap_OtherCommitment / us-gaap_StatementBusinessSegmentsAxis = amrn_BiopharmaceuticalMember |  |  |
Repayment under agreement | 4,800,000 amrn_GuaranteePayments / us-gaap_StatementBusinessSegmentsAxis = amrn_BiopharmaceuticalMember |  |  |  |  |
Biopharma Debt | February 2015 |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |
Future minimum repayment under agreement | 1,600,000 amrn_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 | 10,000,000 amrn_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 | 15,000,000 amrn_FutureMinimumGuaranteePayments / amrn_PeriodAxis = amrn_PeriodThreeMember / us-gaap_StatementBusinessSegmentsAxis = amrn_BiopharmaceuticalMember |  |  |  |  |
Biopharma Debt | Final Payment |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |
Future minimum repayment under agreement | 13,000,000 amrn_FutureMinimumGuaranteePayments / amrn_PeriodAxis = amrn_PeriodFourMember / us-gaap_StatementBusinessSegmentsAxis = amrn_BiopharmaceuticalMember |  |  |  |  |
Biopharma Debt | Cash |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |
Interest expense | 7,200,000 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = amrn_BiopharmaceuticalMember / us-gaap_StatementScenarioAxis = amrn_ChargesCashMember | 11,300,000 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = amrn_BiopharmaceuticalMember / us-gaap_StatementScenarioAxis = amrn_ChargesCashMember |  |  |  |
Biopharma Debt | Non Cash |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |
Interest expense | $ 1,900,000 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = amrn_BiopharmaceuticalMember / us-gaap_StatementScenarioAxis = amrn_NonCashMember | $ 2,600,000 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = amrn_BiopharmaceuticalMember / us-gaap_StatementScenarioAxis = amrn_NonCashMember |  |  |  |

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- Definition Additional Percentage Interest Rate Penalty + References No definition available. + Details
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- Details
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- Definition Debt Instrument Maturity Date Year + References No definition available. + Details
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- Definition Future Minimum Guarantee Payments + References No definition available. + Details
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- Definition Guarantee Payments + References No definition available. + Details
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- Definition Amount of other increase (decrease) in additional paid in capital (APIC). + References No definition available. + Details
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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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- Definition The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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