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Related Party Transaction - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Oct. 31, 2009 Point | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Related Party Transaction [Line Items] |  |  |  |
Derivative liability |  | $ 7,519 us-gaap_DerivativeLiabilities | $ 17,994 us-gaap_DerivativeLiabilities | $ 69,431 us-gaap_DerivativeLiabilities
October 2009 Private Placement | Warrant |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Derivative liability |  | 100 us-gaap_DerivativeLiabilities / us-gaap_DerivativeByNatureAxis = us-gaap_WarrantMember / amrn_TypesOfTransactionsAxis = amrn_OctoberTwentyZeroNinePrivatePlacementMember |  |
Derivative liability, fair value |  | $ 65 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeByNatureAxis = us-gaap_WarrantMember / amrn_TypesOfTransactionsAxis = amrn_OctoberTwentyZeroNinePrivatePlacementMember |  |
October 2009 Private Placement | American Depository Shares |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Purchase of ADSs (in the form of common stock) by directors in private placement | 36,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = amrn_AmericanDepositorySharesMember / amrn_TypesOfTransactionsAxis = amrn_OctoberTwentyZeroNinePrivatePlacementMember |  |  |
Number of ADS that can be purchased for each warrant received | 0.5 amrn_ClassOfWarrantOrRightCommonStockExchangeRatio / us-gaap_StatementEquityComponentsAxis = amrn_AmericanDepositorySharesMember / amrn_TypesOfTransactionsAxis = amrn_OctoberTwentyZeroNinePrivatePlacementMember |  |  |
October 2009 Private Placement | American Depository Shares | Abingworth LLP |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Purchase of ADSs (in the form of common stock) by directors in private placement | 17,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amrn_AbingworthLimitedLiabilityPartnershipMember / us-gaap_StatementEquityComponentsAxis = amrn_AmericanDepositorySharesMember / amrn_TypesOfTransactionsAxis = amrn_OctoberTwentyZeroNinePrivatePlacementMember |  |  |
October 2009 Private Placement | American Depository Shares | Orbimed Advisors LLC |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Purchase of ADSs (in the form of common stock) by directors in private placement | 7,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amrn_OrbimedAdvisorsLimitedLiabilityCompanyMember / us-gaap_StatementEquityComponentsAxis = amrn_AmericanDepositorySharesMember / amrn_TypesOfTransactionsAxis = amrn_OctoberTwentyZeroNinePrivatePlacementMember |  |  |
October 2009 Private Placement | American Depository Shares | Sofinnova Venture Partners VII, LP |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Purchase of ADSs (in the form of common stock) by directors in private placement | 7,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amrn_SofinnovaVenturePartnersVIILimitedPartnershipMember / us-gaap_StatementEquityComponentsAxis = amrn_AmericanDepositorySharesMember / amrn_TypesOfTransactionsAxis = amrn_OctoberTwentyZeroNinePrivatePlacementMember |  |  |
October 2009 Private Placement | American Depository Shares | Fountain Healthcare Partners Fund 1, LP |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Purchase of ADSs (in the form of common stock) by directors in private placement | 5,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amrn_FountainHealthcarePartnersFundOneLimitedPartnershipMember / us-gaap_StatementEquityComponentsAxis = amrn_AmericanDepositorySharesMember / amrn_TypesOfTransactionsAxis = amrn_OctoberTwentyZeroNinePrivatePlacementMember |  |  |

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