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Change in Fair Value of Derivative Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Derivatives, Fair Value [Line Items]
Beginning Balance	$ 7,519us-gaap_DerivativeLiabilities	$ 17,994us-gaap_DerivativeLiabilities
Record derivative liability	868us-gaap_IncreaseDecreaseInDerivativeLiabilities
Gain on change in fair value of derivative liabilities	(464)us-gaap_UnrealizedGainLossOnDerivatives	(4,393)us-gaap_UnrealizedGainLossOnDerivatives
Transfer derivative liability to equity	(1,814)amrn_DerivativeLiabilitiesTransferredToStockholdersEquity
Ending Balance	6,100us-gaap_DerivativeLiabilities	13,529us-gaap_DerivativeLiabilities
Warrant
Derivatives, Fair Value [Line Items]
Compensation income for change in fair value of warrants issued to former employees	(9)us-gaap_ShareBasedCompensation / us-gaap_DerivativeByNatureAxis = us-gaap_WarrantMember	(72)us-gaap_ShareBasedCompensation / us-gaap_DerivativeByNatureAxis = us-gaap_WarrantMember
Warrants Issued October 2009
Derivatives, Fair Value [Line Items]
Beginning Balance	119us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember	6,894us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember
Gain on change in fair value of derivative liabilities	(110)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember	(893)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember
Ending Balance		5,929us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember
Warrants Issued October 2009 | Warrant
Derivatives, Fair Value [Line Items]
Compensation income for change in fair value of warrants issued to former employees	(9)us-gaap_ShareBasedCompensation / us-gaap_DerivativeByNatureAxis = us-gaap_WarrantMember / us-gaap_DerivativeInstrumentRiskAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember	(72)us-gaap_ShareBasedCompensation / us-gaap_DerivativeByNatureAxis = us-gaap_WarrantMember / us-gaap_DerivativeInstrumentRiskAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember
Embedded Derivative Financial Instruments
Derivatives, Fair Value [Line Items]
Beginning Balance	7,400us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember	11,100us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
Gain on change in fair value of derivative liabilities	(1,300)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember	(3,500)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
Ending Balance	6,100us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember	7,600us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
Preferred Stock Purchase Option
Derivatives, Fair Value [Line Items]
Record derivative liability	868us-gaap_IncreaseDecreaseInDerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = amrn_PreferredStockPurchaseOptionMember
Gain on change in fair value of derivative liabilities	946us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = amrn_PreferredStockPurchaseOptionMember
Transfer derivative liability to equity	$ (1,814)amrn_DerivativeLiabilitiesTransferredToStockholdersEquity / us-gaap_DerivativeInstrumentRiskAxis = amrn_PreferredStockPurchaseOptionMember

X

- Definition

Derivative Liabilities Transferred to Stockholders' Equity

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ 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 815

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313

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X

- Definition

The increase (decrease) during the period in the carrying value of derivative instruments reported as liabilities that are due to be disposed of within one year (or the normal operating cycle, if longer).

+ References

No definition available.

+ Details

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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X

- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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- Details

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