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Commitments and Contingencies - Additional Information (Detail) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 USD ($) | Mar. 31, 2015 Further Indication for AMR101 Laxdale Limited USD ($) | Mar. 31, 2015 Further Indication for AMR101 Laxdale Limited GBP (£) | Mar. 31, 2015 Further Indication for AMR101 Laxdale Limited Potential Marketing Approval 1 USD ($) | Mar. 31, 2015 Further Indication for AMR101 Laxdale Limited Potential Marketing Approval 1 GBP (£) | Mar. 31, 2015 Further Indication for AMR101 Laxdale Limited Potential Marketing Approval 2 USD ($) | Mar. 31, 2015 Further Indication for AMR101 Laxdale Limited Potential Marketing Approval 2 GBP (£) | Mar. 31, 2015 Further Indication for AMR101 Laxdale Limited Maximum USD ($) | Mar. 31, 2015 Further Indication for AMR101 Laxdale Limited Maximum GBP (£)
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Potential payment over the agreement terms | $ 54.3 amrn_AmountOfPotentialFutureFinancialObligations |  |  |  |  |  |  |  |
Potential aggregate stock or cash payment |  | $ 11.1 us-gaap_RoyaltyGuaranteesCommitmentsAmount / amrn_LiabilitiesForCommitmentsAxis = amrn_LaxdaleLimitedMember / us-gaap_StatementScenarioAxis = amrn_FurtherIndicationForAmrOneZeroOneMember | £ 7.5 us-gaap_RoyaltyGuaranteesCommitmentsAmount / amrn_LiabilitiesForCommitmentsAxis = amrn_LaxdaleLimitedMember / us-gaap_StatementScenarioAxis = amrn_FurtherIndicationForAmrOneZeroOneMember | $ 7.4 us-gaap_RoyaltyGuaranteesCommitmentsAmount / amrn_BusinessDevelopmentsAxis = amrn_PotentialMarketingApprovalOneMember / amrn_LiabilitiesForCommitmentsAxis = amrn_LaxdaleLimitedMember / us-gaap_StatementScenarioAxis = amrn_FurtherIndicationForAmrOneZeroOneMember | £ 5.0 us-gaap_RoyaltyGuaranteesCommitmentsAmount / amrn_BusinessDevelopmentsAxis = amrn_PotentialMarketingApprovalOneMember / amrn_LiabilitiesForCommitmentsAxis = amrn_LaxdaleLimitedMember / us-gaap_StatementScenarioAxis = amrn_FurtherIndicationForAmrOneZeroOneMember | $ 7.4 us-gaap_RoyaltyGuaranteesCommitmentsAmount / amrn_BusinessDevelopmentsAxis = amrn_PotentialMarketingApprovalTwoMember / amrn_LiabilitiesForCommitmentsAxis = amrn_LaxdaleLimitedMember / us-gaap_StatementScenarioAxis = amrn_FurtherIndicationForAmrOneZeroOneMember | £ 5.0 us-gaap_RoyaltyGuaranteesCommitmentsAmount / amrn_BusinessDevelopmentsAxis = amrn_PotentialMarketingApprovalTwoMember / amrn_LiabilitiesForCommitmentsAxis = amrn_LaxdaleLimitedMember / us-gaap_StatementScenarioAxis = amrn_FurtherIndicationForAmrOneZeroOneMember | $ 14.8 us-gaap_RoyaltyGuaranteesCommitmentsAmount / amrn_LiabilitiesForCommitmentsAxis = amrn_LaxdaleLimitedMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementScenarioAxis = amrn_FurtherIndicationForAmrOneZeroOneMember | £ 10.0 us-gaap_RoyaltyGuaranteesCommitmentsAmount / amrn_LiabilitiesForCommitmentsAxis = amrn_LaxdaleLimitedMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementScenarioAxis = amrn_FurtherIndicationForAmrOneZeroOneMember

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- Definition Amount Of Potential Future Financial Obligations + References No definition available. + Details
Name: | amrn_AmountOfPotentialFutureFinancialObligations
Namespace Prefix: | amrn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | amrn_CommitmentsAndContingenciesDisclosureLineItems
Namespace Prefix: | amrn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_RoyaltyGuaranteesCommitmentsAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant