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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	$ 54.3amrn_AmountOfPotentialFutureFinancialObligations
Potential aggregate stock or cash payment		$ 11.1us-gaap_RoyaltyGuaranteesCommitmentsAmount / amrn_LiabilitiesForCommitmentsAxis = amrn_LaxdaleLimitedMember / us-gaap_StatementScenarioAxis = amrn_FurtherIndicationForAmrOneZeroOneMember	£ 7.5us-gaap_RoyaltyGuaranteesCommitmentsAmount / amrn_LiabilitiesForCommitmentsAxis = amrn_LaxdaleLimitedMember / us-gaap_StatementScenarioAxis = amrn_FurtherIndicationForAmrOneZeroOneMember	$ 7.4us-gaap_RoyaltyGuaranteesCommitmentsAmount / amrn_BusinessDevelopmentsAxis = amrn_PotentialMarketingApprovalOneMember / amrn_LiabilitiesForCommitmentsAxis = amrn_LaxdaleLimitedMember / us-gaap_StatementScenarioAxis = amrn_FurtherIndicationForAmrOneZeroOneMember	£ 5.0us-gaap_RoyaltyGuaranteesCommitmentsAmount / amrn_BusinessDevelopmentsAxis = amrn_PotentialMarketingApprovalOneMember / amrn_LiabilitiesForCommitmentsAxis = amrn_LaxdaleLimitedMember / us-gaap_StatementScenarioAxis = amrn_FurtherIndicationForAmrOneZeroOneMember	$ 7.4us-gaap_RoyaltyGuaranteesCommitmentsAmount / amrn_BusinessDevelopmentsAxis = amrn_PotentialMarketingApprovalTwoMember / amrn_LiabilitiesForCommitmentsAxis = amrn_LaxdaleLimitedMember / us-gaap_StatementScenarioAxis = amrn_FurtherIndicationForAmrOneZeroOneMember	£ 5.0us-gaap_RoyaltyGuaranteesCommitmentsAmount / amrn_BusinessDevelopmentsAxis = amrn_PotentialMarketingApprovalTwoMember / amrn_LiabilitiesForCommitmentsAxis = amrn_LaxdaleLimitedMember / us-gaap_StatementScenarioAxis = amrn_FurtherIndicationForAmrOneZeroOneMember	$ 14.8us-gaap_RoyaltyGuaranteesCommitmentsAmount / amrn_LiabilitiesForCommitmentsAxis = amrn_LaxdaleLimitedMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementScenarioAxis = amrn_FurtherIndicationForAmrOneZeroOneMember	£ 10.0us-gaap_RoyaltyGuaranteesCommitmentsAmount / amrn_LiabilitiesForCommitmentsAxis = amrn_LaxdaleLimitedMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementScenarioAxis = amrn_FurtherIndicationForAmrOneZeroOneMember

X

- Definition

Amount Of Potential Future Financial Obligations

+ References

No definition available.

+ Details

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X

- 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

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