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Commitments and Contingencies - Additional Information (Detail) | 12 Months Ended |  |  | 0 Months Ended | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 48 Months Ended | 1 Months Ended | 12 Months Ended |  |  |  | 12 Months Ended | 36 Months Ended |
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Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2014 Dublin | Nov. 01, 2013 Dublin sqft | Sep. 30, 2011 Dublin USD ($) sqft Y | Sep. 30, 2011 Dublin EUR (€) | May 08, 2013 Bedminster sqft | Dec. 15, 2012 Bedminster sqft | Dec. 06, 2011 Bedminster sqft | Apr. 30, 2014 Bedminster sqft | Jan. 31, 2014 Bedminster sqft | Dec. 31, 2014 Bedminster | Jul. 01, 2011 Bedminster sqft | Jan. 31, 2015 Sublease Bedminster Subsequent Event sqft | Dec. 31, 2014 Amr One Hundred One Contract | Apr. 30, 2014 BASF USD ($) | Dec. 31, 2014 BASF | Dec. 31, 2014 BASF USD ($) | Aug. 31, 2014 Chemport USD ($) | Sep. 30, 2013 Chemport USD ($) | Jul. 31, 2011 Chemport USD ($) | Dec. 31, 2014 Chemport USD ($) | Dec. 31, 2013 Chemport USD ($) | Dec. 31, 2012 Chemport Anticipated investment before the end of 2012 USD ($) | Dec. 31, 2014 Chemport Maximum USD ($) | Dec. 31, 2014 Slanmhor USD ($) | Dec. 31, 2013 Slanmhor USD ($) | Dec. 31, 2014 Slanmhor USD ($) | Dec. 31, 2014 First Indication for AMR101 Laxdale Limited USD ($) | Dec. 31, 2014 First Indication for AMR101 Laxdale Limited GBP (£) | Dec. 31, 2014 Further Indication for AMR101 Laxdale Limited Potential Marketing Approval 1 USD ($) | Dec. 31, 2014 Further Indication for AMR101 Laxdale Limited Potential Marketing Approval 1 GBP (£) | Dec. 31, 2014 Further Indication for AMR101 Laxdale Limited Potential Marketing Approval 2 USD ($) | Dec. 31, 2014 Further Indication for AMR101 Laxdale Limited Potential Marketing Approval 2 GBP (£) | Dec. 31, 2014 Further Indication for AMR101 Laxdale Limited Maximum USD ($) | Dec. 31, 2014 Further Indication for AMR101 Laxdale Limited Maximum GBP (£)
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Office space leased (in square feet) |  |  |  |  | 270 amrn_NumberOfLeasableSquareFeet / amrn_LocationAxis = amrn_DublinMember | 320 amrn_NumberOfLeasableSquareFeet / amrn_LocationAxis = amrn_DublinMember | 320 amrn_NumberOfLeasableSquareFeet / amrn_LocationAxis = amrn_DublinMember |  |  |  |  |  |  | 9,747 amrn_NumberOfLeasableSquareFeet / amrn_LocationAxis = amrn_BedminsterMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, expiration date |  |  |  | Oct. 31, 2015 |  |  |  |  |  |  |  |  | Mar. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, renewal option |  |  |  |  |  | 1 amrn_RenewalOptionTermsMaximumAdditionalPeriodInYears / amrn_LocationAxis = amrn_DublinMember | 1 amrn_RenewalOptionTermsMaximumAdditionalPeriodInYears / amrn_LocationAxis = amrn_DublinMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, monthly rent |  |  |  |  |  | $ 3,400 amrn_LeaseAgreementMonthlyPayment / amrn_LocationAxis = amrn_DublinMember | € 2,800 amrn_LeaseAgreementMonthlyPayment / amrn_LocationAxis = amrn_DublinMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional office space leased (in square feet) |  |  |  |  |  |  |  | 10,883 amrn_AdditionalSquareFeetLeased / amrn_LocationAxis = amrn_BedminsterMember | 2,601 amrn_AdditionalSquareFeetLeased / amrn_LocationAxis = amrn_BedminsterMember | 2,142 amrn_AdditionalSquareFeetLeased / amrn_LocationAxis = amrn_BedminsterMember |  |  |  |  | 4,700 amrn_AdditionalSquareFeetLeased / amrn_LocationAxis = amrn_BedminsterMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = amrn_SubleaseMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Square feet vacated in exchange for reduction on future rent payments |  |  |  |  |  |  |  |  |  |  | 2,000 amrn_SquareFeetVacated / amrn_LocationAxis = amrn_BedminsterMember | 2,142 amrn_SquareFeetVacated / amrn_LocationAxis = amrn_BedminsterMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, rental expense | 1,000,000 us-gaap_OperatingLeasesRentExpenseNet | 1,000,000 us-gaap_OperatingLeasesRentExpenseNet | 600,000 us-gaap_OperatingLeasesRentExpenseNet |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of signed agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 amrn_NumberOfAgreements / amrn_LiabilitiesForCommitmentsAxis = amrn_AmrOneHundredOneMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment made under the agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,100,000 us-gaap_PaymentsForPurchaseOfOtherAssets1 / amrn_LiabilitiesForCommitmentsAxis = amrn_SupplierTwoMember |  |  |  | 6,700,000 us-gaap_PaymentsForPurchaseOfOtherAssets1 / amrn_LiabilitiesForCommitmentsAxis = amrn_ChemportMember |  |  |  | 400,000 us-gaap_PaymentsForPurchaseOfOtherAssets1 / amrn_LiabilitiesForCommitmentsAxis = amrn_SupplierThreeMember | 6,100,000 us-gaap_PaymentsForPurchaseOfOtherAssets1 / amrn_LiabilitiesForCommitmentsAxis = amrn_SupplierThreeMember | 6,200,000 us-gaap_PaymentsForPurchaseOfOtherAssets1 / amrn_LiabilitiesForCommitmentsAxis = amrn_SupplierThreeMember |  |  |  |  |  |  |  |
Supply agreement expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2014-02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Refund received for material repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 us-gaap_ProceedsFromRefundsFromSuppliersOfMaterial / amrn_LiabilitiesForCommitmentsAxis = amrn_SupplierTwoMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential payment over the agreement terms | 55,500,000 amrn_AmountOfPotentialFutureFinancialObligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minority share equity investment commitment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,600,000 amrn_CommitmentsToPurchaseOrFundInvestments / us-gaap_FairValueByLiabilityClassAxis = us-gaap_CommitmentsMember / amrn_LiabilitiesForCommitmentsAxis = amrn_ChemportMember | 3,300,000 amrn_CommitmentsToPurchaseOrFundInvestments / amrn_LiabilitiesForCommitmentsAxis = amrn_ChemportMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |  |  |  |
Cash paid for cost method investment |  |  | 1,650,000 us-gaap_PaymentsToAcquireLongtermInvestments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 us-gaap_PaymentsToAcquireLongtermInvestments / amrn_LiabilitiesForCommitmentsAxis = amrn_ChemportMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in supplier sold amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 us-gaap_EquityMethodInvestmentSoldCarryingAmount / amrn_LiabilitiesForCommitmentsAxis = amrn_ChemportMember | 1,300,000 us-gaap_EquityMethodInvestmentSoldCarryingAmount / amrn_LiabilitiesForCommitmentsAxis = amrn_ChemportMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carry amount of investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 us-gaap_EquityMethodInvestments / amrn_LiabilitiesForCommitmentsAxis = amrn_ChemportMember | 3,300,000 us-gaap_EquityMethodInvestments / amrn_LiabilitiesForCommitmentsAxis = amrn_ChemportMember |  |  |  |  |  |  |  |  |  |  |  |  |
Potential aggregate stock or cash payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,700,000 us-gaap_RoyaltyGuaranteesCommitmentsAmount / amrn_LiabilitiesForCommitmentsAxis = amrn_LaxdaleLimitedMember / us-gaap_StatementScenarioAxis = amrn_FirstIndicationForAmrOneZeroOneMember | £ 7,500,000 us-gaap_RoyaltyGuaranteesCommitmentsAmount / amrn_LiabilitiesForCommitmentsAxis = amrn_LaxdaleLimitedMember / us-gaap_StatementScenarioAxis = amrn_FirstIndicationForAmrOneZeroOneMember | $ 7,800,000 us-gaap_RoyaltyGuaranteesCommitmentsAmount / amrn_BusinessDevelopmentsAxis = amrn_PotentialMarketingApprovalOneMember / amrn_LiabilitiesForCommitmentsAxis = amrn_LaxdaleLimitedMember / us-gaap_StatementScenarioAxis = amrn_FurtherIndicationForAmrOneZeroOneMember | £ 5,000,000 us-gaap_RoyaltyGuaranteesCommitmentsAmount / amrn_BusinessDevelopmentsAxis = amrn_PotentialMarketingApprovalOneMember / amrn_LiabilitiesForCommitmentsAxis = amrn_LaxdaleLimitedMember / us-gaap_StatementScenarioAxis = amrn_FurtherIndicationForAmrOneZeroOneMember | $ 7,800,000 us-gaap_RoyaltyGuaranteesCommitmentsAmount / amrn_BusinessDevelopmentsAxis = amrn_PotentialMarketingApprovalTwoMember / amrn_LiabilitiesForCommitmentsAxis = amrn_LaxdaleLimitedMember / us-gaap_StatementScenarioAxis = amrn_FurtherIndicationForAmrOneZeroOneMember | £ 5,000,000 us-gaap_RoyaltyGuaranteesCommitmentsAmount / amrn_BusinessDevelopmentsAxis = amrn_PotentialMarketingApprovalTwoMember / amrn_LiabilitiesForCommitmentsAxis = amrn_LaxdaleLimitedMember / us-gaap_StatementScenarioAxis = amrn_FurtherIndicationForAmrOneZeroOneMember | $ 15,500,000 us-gaap_RoyaltyGuaranteesCommitmentsAmount / amrn_LiabilitiesForCommitmentsAxis = amrn_LaxdaleLimitedMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementScenarioAxis = amrn_FurtherIndicationForAmrOneZeroOneMember | £ 10,000,000 us-gaap_RoyaltyGuaranteesCommitmentsAmount / amrn_LiabilitiesForCommitmentsAxis = amrn_LaxdaleLimitedMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementScenarioAxis = amrn_FurtherIndicationForAmrOneZeroOneMember

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- Definition Additional Square Feet Leased + References No definition available. + Details
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- Definition Amount Of Potential Future Financial Obligations + References No definition available. + Details
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- Details
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- Definition Commitments To Purchase Or Fund Investments + References No definition available. + Details
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- Definition Lease Agreement Monthly payment + References No definition available. + Details
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- Definition Number of Leasable Square Feet + References No definition available. + Details
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- Definition Square Feet Vacated + References No definition available. + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + 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 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 + Details
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- Definition Amount of the entity's equity method investment which has been sold. + References No definition available. + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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- Definition Amount of cash paid to purchase other assets as part of operating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3367-108585 + Details
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- Definition The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, beyond the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the long-term. + References No definition available. + Details
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- Definition Cash received for refunds from suppliers during the current period. This element includes refunds from suppliers of materials; it excludes refunds from providers of fixed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The amount the entity has committed to make for future royalty guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 440 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473578&loc=d3e63223-108013 + Details
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