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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
Debt Instrument [Line Items]
Long term debt-December 2012 financing, carrying value	$ 90,082us-gaap_LongTermDebtNoncurrent	$ 89,617us-gaap_LongTermDebtNoncurrent
Long term debt-December 2012 financing, estimated fair value	84,900us-gaap_LongTermDebtFairValue	81,000us-gaap_LongTermDebtFairValue
Convertible Debt | 2012 Notes
Debt Instrument [Line Items]
Exchangeable senior notes, carrying value	31,266us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember	31,266us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Exchangeable senior notes, estimated fair value	26,521us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember	25,689us-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	91,926us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember	90,580us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Exchangeable senior notes, estimated fair value	$ 124,932us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember	$ 75,533us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember	$ 90,800us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember

X

- 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

X

- Details

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

X

- 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

X

- 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

X

- 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

X

- Details

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