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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 | $ 17,994 us-gaap_DerivativeLiabilities | $ 69,431 us-gaap_DerivativeLiabilities |
Record initial fair value of derivative liability on 2014 senior notes | 3,500 us-gaap_ConvertibleDebtFairValueDisclosures |  |
(Gain) loss on change in fair value of derivative liability | (13,472)us-gaap_UnrealizedGainLossOnDerivatives | (47,710)us-gaap_UnrealizedGainLossOnDerivatives | 35,344 us-gaap_UnrealizedGainLossOnDerivatives
Transfers to equity |  | (24)amrn_DerivativeLiabilitiesTransferredToStockholdersEquity |
Ending Balance | 7,519 us-gaap_DerivativeLiabilities | 17,994 us-gaap_DerivativeLiabilities | 69,431 us-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 | 247 us-gaap_ShareBasedCompensation / us-gaap_DerivativeByNatureAxis = us-gaap_WarrantMember
Warrants Issued October 2009 |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Beginning Balance | 6,894 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember | 54,854 us-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 | 119 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember | 6,894 us-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 | 11,100 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember | 14,577 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember |
Record initial fair value of derivative liability on 2014 senior notes | 3,500 us-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 | $ 7,400 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember | $ 11,100 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember |

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- Definition Derivative Liabilities Transferred to Stockholders' Equity + References No definition available. + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Convertible Security -URI http://asc.fasb.org/extlink&oid=6509036 + Details
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- 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 + 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 + Details
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- 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 + Details
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