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Carrying Amounts and Estimated Fair Values of Debt Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | May 31, 2014
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Debt Instrument [Line Items] |  |  |
Long term debt-December 2012 financing, carrying value | $ 90,082 us-gaap_LongTermDebtNoncurrent | $ 89,617 us-gaap_LongTermDebtNoncurrent |
Long term debt-December 2012 financing, estimated fair value | 84,900 us-gaap_LongTermDebtFairValue | 81,000 us-gaap_LongTermDebtFairValue |
Convertible Debt | 2012 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Exchangeable senior notes, carrying value | 31,266 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 31,266 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |
Exchangeable senior notes, estimated fair value | 26,521 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 25,689 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |
Convertible Debt | 2014 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Exchangeable senior notes, carrying value | 91,926 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 90,580 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |
Exchangeable senior notes, estimated fair value | $ 124,932 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | $ 75,533 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | $ 90,800 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13476-108611 + Details
Name: | us-gaap_DebtInstrumentFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
Name: | us-gaap_LongTermDebtNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
Name: | us-gaap_SeniorNotes
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_ConvertibleDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |