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Subsequent Events - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended
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Dec. 31, 2014 | Feb. 26, 2015 | Jan. 29, 2015
Subsequent Event [Line Items] |  |  |
Granted options | 3,271,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod |  |
Subsequent Event | Eddingpharm |  |  |
Subsequent Event [Line Items] |  |  |
Non-refundable up-front received |  | $ 15.0 amrn_NonRefundableUpfrontPaymentsReceived / amrn_BusinessDevelopmentsAxis = amrn_EddingpharmMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Subsequent Event | Eddingpharm | Maximum |  |  |
Subsequent Event [Line Items] |  |  |
Additional upfront payment eligible to receive based on development, regulatory and sales Milestone |  | $ 154.0 amrn_EligibleMilestonePayment / amrn_BusinessDevelopmentsAxis = amrn_EddingpharmMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Subsequent Event | Restricted Stock Units (RSUs) |  |  |
Subsequent Event [Line Items] |  |  |
Granted options |  |  | 2,564,251 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Vesting period |  |  | 3 years
Subsequent Event | Stock options |  |  |
Subsequent Event [Line Items] |  |  |
Granted options |  |  | 1,622,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Vesting period |  |  | 4 years

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- Definition Eligible Milestone Payment + References No definition available. + Details
Name: | amrn_EligibleMilestonePayment
Namespace Prefix: | amrn_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition Non Refundable Upfront Payments Received + References No definition available. + Details
Name: | amrn_NonRefundableUpfrontPaymentsReceived
Namespace Prefix: | amrn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |