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Equity - Additional Information (Detail) | 0 Months Ended | 3 Months Ended |  |  | 3 Months Ended | 0 Months Ended |  |  |  |  | 0 Months Ended
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Mar. 05, 2015 | Mar. 31, 2015 USD ($) | Mar. 31, 2014 USD ($) | Mar. 31, 2015 GBP (£) | Dec. 31, 2014 GBP (£) | Mar. 31, 2015 Preferred Stock Purchase Option USD ($) | Mar. 31, 2015 Minimum | Mar. 31, 2015 Maximum | Mar. 05, 2015 American Depository Shares USD ($) | Mar. 31, 2015 American Depository Shares USD ($) | Mar. 30, 2015 American Depository Shares USD ($) | Mar. 30, 2015 Series A Preferred Stock | Mar. 05, 2015 Series A Preferred Stock GBP (£) | Mar. 31, 2015 Employee tax obligations | Jan. 29, 2015 Restricted Stock Units (RSUs) Subsequent Event | Jan. 29, 2015 Stock options Subsequent Event | Mar. 11, 2014 Stock Incentive Plan 2011 | Jan. 29, 2015 Stock Incentive Plan 2011 Restricted Stock Units (RSUs) | Mar. 11, 2014 Stock Incentive Plan 2011 Restricted Stock Units (RSUs) | Jan. 29, 2015 Stock Incentive Plan 2011 Stock Options
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, exercise of warrants |  | 1,844,585 amrn_StockIssuedDuringPeriodSharesStockWarrantsExercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from exercise of warrants, gross of transaction costs |  | $ 2,800,000 amrn_ProceedsFromWarrantExercisesGross |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from exercise of warrants, net of transaction costs |  | 2,713,000 us-gaap_ProceedsFromWarrantExercises |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, exercise of stock options |  | 2,114 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 215,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from exercise of stock options, net of transaction costs |  | 4,000 us-gaap_ProceedsFromStockOptionsExercised | 285,000 us-gaap_ProceedsFromStockOptionsExercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock units, Granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,564,251 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = amrn_StockIncentivePlanTwentyElevenMember | 173,348 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = amrn_StockIncentivePlanTwentyElevenMember |
Granted options |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,082,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 2,605,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 205,890 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_PlanNameAxis = amrn_StockIncentivePlanTwentyElevenMember |  |  | 1,622,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = amrn_StockIncentivePlanTwentyElevenMember
Stock options, Vesting Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years | 4 years |  | 3 years |  | 4 years
Shares issued, related to the vesting of RSUs |  | 639,500 amrn_StockIssuedDuringPeriodShareExerciseOfStockOptionsVestingOfRestrictedStock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury shares |  | 134,337 us-gaap_TreasuryStockShares |  |  | 20,079 us-gaap_TreasuryStockShares |  |  |  |  |  |  |  |  | 114,258 us-gaap_TreasuryStockShares / amrn_TypeofObligationAxis = amrn_TaxSharingAgreementObligationMember |  |  |  |  |  |
Stock issued under private placement, value |  | 52,253,000 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  |  |  |  |  | 52,800,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = amrn_AmericanDepositorySharesMember |  |  |  |  |  |  |  |  |  |  |
American depositary shares conversion rate to preference shares |  | 1 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion |  |  |  |  |  |  |  |  |  | 1 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 1 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  |  |  |
Preference Shares, par value |  |  |  | £ 0.05 us-gaap_PreferredStockParOrStatedValuePerShare | £ 0.05 us-gaap_PreferredStockParOrStatedValuePerShare |  |  |  |  |  |  |  | £ 0.05 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  |  |  |
Private placement, closing date | Mar. 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share, negotiated price |  |  |  |  |  |  |  |  |  | $ 150,000 amrn_NegotiatedPurchasePricePerUnit / us-gaap_StatementClassOfStockAxis = amrn_AmericanDepositorySharesMember |  |  |  |  |  |  |  |  |  |
Share conversion price |  | $ 1.50 amrn_ConversionPricePerShare |  |  |  |  |  |  |  | $ 1,500,000 amrn_ConversionPricePerShare / us-gaap_StatementClassOfStockAxis = amrn_AmericanDepositorySharesMember |  |  |  |  |  |  |  |  |  |
Aggregate gross proceeds |  | 52,800,000 us-gaap_ProceedsFromIssuanceOfPrivatePlacement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated offering expense |  | 600,000 amrn_OtherEstimatedOfferingCosts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preference shares conversion rate to ordinary share |  | 10.00%amrn_PercentageRepresentationOfCommonStockOutstandingUponConversion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value |  |  |  | £ 0.50 us-gaap_CommonStockParOrStatedValuePerShare | £ 0.50 us-gaap_CommonStockParOrStatedValuePerShare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beneficial ownership limitation |  |  |  |  |  |  | 4.99%amrn_BeneficialOwnershipLimitationPercentage / us-gaap_RangeAxis = us-gaap_MinimumMember | 19.90%amrn_BeneficialOwnershipLimitationPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |  |  |  |  |
Share maximum amount |  | 35,215,079 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market value, per share |  | $ 2.39 us-gaap_SharePrice |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BCF resulting from issuance of Series A Preference Shares |  | 31,300,000 us-gaap_DebtInstrumentConvertibleBeneficialConversionFeature |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional shares purchase amount |  |  |  |  |  |  |  |  |  |  | 5,800,000 amrn_ShareRepurchaseProgramAdditionalAuthorizedAmount / us-gaap_StatementClassOfStockAxis = amrn_AmericanDepositorySharesMember |  |  |  |  |  |  |  |  |
Preferred stock purchase option derivative liability at fair value |  |  |  |  |  | 900,000 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = amrn_PreferredStockPurchaseOptionMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on change in fair value of derivatives |  |  |  |  |  | 900,000 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = amrn_PreferredStockPurchaseOptionMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfer derivative liability to equity |  | $ 1,814,000 amrn_DerivativeLiabilitiesTransferredToStockholdersEquity |  |  |  | $ 1,814,000 amrn_DerivativeLiabilitiesTransferredToStockholdersEquity / us-gaap_DerivativeInstrumentRiskAxis = amrn_PreferredStockPurchaseOptionMember |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
Name: | us-gaap_TreasuryStockShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant