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Change in Fair Value of Derivative Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Beginning Balance	$ 17,994us-gaap_DerivativeLiabilities	$ 69,431us-gaap_DerivativeLiabilities
Record initial fair value of derivative liability on 2014 senior notes	3,500us-gaap_ConvertibleDebtFairValueDisclosures
(Gain) loss on change in fair value of derivative liability	(13,472)us-gaap_UnrealizedGainLossOnDerivatives	(47,710)us-gaap_UnrealizedGainLossOnDerivatives	35,344us-gaap_UnrealizedGainLossOnDerivatives
Transfers to equity		(24)amrn_DerivativeLiabilitiesTransferredToStockholdersEquity
Ending Balance	7,519us-gaap_DerivativeLiabilities	17,994us-gaap_DerivativeLiabilities	69,431us-gaap_DerivativeLiabilities
Warrant
Derivatives, Fair Value [Line Items]
Compensation income for change in fair value of warrants issued to former employees	(503)us-gaap_ShareBasedCompensation / us-gaap_DerivativeByNatureAxis = us-gaap_WarrantMember	(3,703)us-gaap_ShareBasedCompensation / us-gaap_DerivativeByNatureAxis = us-gaap_WarrantMember	247us-gaap_ShareBasedCompensation / us-gaap_DerivativeByNatureAxis = us-gaap_WarrantMember
Warrants Issued October 2009
Derivatives, Fair Value [Line Items]
Beginning Balance	6,894us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember	54,854us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember
(Gain) loss on change in fair value of derivative liability	(6,272)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember	(44,233)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember
Transfers to equity		(24)amrn_DerivativeLiabilitiesTransferredToStockholdersEquity / us-gaap_DerivativeInstrumentRiskAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember
Ending Balance	119us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember	6,894us-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	(503)us-gaap_ShareBasedCompensation / us-gaap_DerivativeByNatureAxis = us-gaap_WarrantMember / us-gaap_DerivativeInstrumentRiskAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember	(3,703)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	11,100us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember	14,577us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
Record initial fair value of derivative liability on 2014 senior notes	3,500us-gaap_ConvertibleDebtFairValueDisclosures / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
(Gain) loss on change in fair value of derivative liability	(7,200)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember	(3,477)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
Ending Balance	$ 7,400us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember	$ 11,100us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember

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Derivative Liabilities Transferred to Stockholders' Equity

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- Definition

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

+ References

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-Publisher FASB

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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.

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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.

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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.

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