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Significant Accounting Policies - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended |
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Oct. 31, 2009 | Dec. 31, 2014 Segment | Dec. 31, 2013 | Dec. 31, 2012 | May 31, 2014
Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred revenue |  | $ 0 us-gaap_DeferredRevenueCurrent | $ 1,703,000 us-gaap_DeferredRevenueCurrent |  |
Sales discount percentage |  | 2.00%amrn_CashDiscountPercent |  |  |
Sales discount term |  | 30 days |  |  |
Trade receivables, credit period |  | 30 days |  |  |
Accounts receivable written off |  | 0 amrn_WriteOffsOfAccountsReceivables | 0 amrn_WriteOffsOfAccountsReceivables |  |
Warrant derivative liability | 48,300,000 us-gaap_DerivativeLiabilitiesCurrent | 119,000 us-gaap_DerivativeLiabilitiesCurrent | 6,894,000 us-gaap_DerivativeLiabilitiesCurrent |  |
Derivative liability fair value assumptions, risk-free rate | 2.37%us-gaap_FairValueAssumptionsRiskFreeInterestRate | 0.04%us-gaap_FairValueAssumptionsRiskFreeInterestRate | 0.12%us-gaap_FairValueAssumptionsRiskFreeInterestRate |  |
Derivative liability fair value assumptions, term | 5 years | 1 month 28 days | 9 months 18 days |  |
Derivative liability fair value assumptions, dividend yield | 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate | 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate | 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate |  |
Derivative liability fair value assumptions, volatility rate | 119.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate | 79.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate | 99.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate |  |
Warrants expiration date | Feb. 27, 2015 |  |  |  |
Gain (loss) on change in fair value of derivative liability |  | 13,472,000 us-gaap_UnrealizedGainLossOnDerivatives | 47,710,000 us-gaap_UnrealizedGainLossOnDerivatives | (35,344,000)us-gaap_UnrealizedGainLossOnDerivatives |
Market price of common stock |  | $ 0.98 us-gaap_SharePrice |  |  |
Hypothetical increase in market price of common shares |  | 10.00%amrn_SignificantAssumptionsInMarketPriceOfStock |  |  |
Long term debt redemption feature |  |  |  | 14,600,000 us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability |
Number of operating segments |  | 1 us-gaap_NumberOfOperatingSegments |  |  |
Prior To Agreement |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Warrants expiration date | Oct. 16, 2014 |  |  |  |
Foreign Exchange Contract |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Derivative, amount outstanding |  | 0 amrn_DerivativeAmountOutstanding / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember |  |  |
Embedded Derivative Financial Instruments |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Gain (loss) on change in fair value of derivative liability |  | 7,200,000 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember | 3,477,000 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember |  |
Change of control obligation |  |  |  | 140,000,000 amrn_ChangeInControlObligations / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember |
Maximum repayment of future revenue and receivables |  |  |  | 150,000,000 us-gaap_OtherCommitment / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember |
Long term debt redemption feature |  | 4,800,000 us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember | 11,100,000 us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember |  |
Gain on change in fair value of derivative liability |  | 6,300,000 amrn_UnrealizedGainOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember |  |  |
Effect of a hypothetical 10% increase in the market price of common shares |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Increase (Decrease) in the fair value of warrant derivative liability |  | 100,000 us-gaap_IncreaseDecreaseInDerivativeLiabilities / us-gaap_StatementScenarioAxis = amrn_ScenarioOneMember |  |  |
Market price of common stock |  | $ 1.08 us-gaap_SharePrice / us-gaap_StatementScenarioAxis = amrn_ScenarioOneMember |  |  |
Convertible Debt |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Carrying value include debt discount |  | 3,500,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |
Gain (loss) on change in fair value of derivative liability |  | 900,000 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |
Convertible Debt | 2014 Notes |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Carrying value include debt discount |  | 27,900,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  | 27,900,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Derivative liability fair value assumptions, risk-free rate |  | 2.70%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |
Derivative liability fair value assumptions, dividend yield |  | 24.80%us-gaap_FairValueAssumptionsExpectedDividendRate / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |
Derivative liability fair value assumptions, volatility rate |  | 82.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |
Gain (loss) on change in fair value of derivative liability |  | 900,000 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |
Long term debt redemption feature |  | 2,600,000 us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |
Convertible Debt | 2012 Notes |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Carrying value include debt discount |  | 0 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 700,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |
Convertible Debt | Non Cash | 2014 Notes |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Carrying value include debt discount |  | 28,200,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = amrn_SeniorNotesTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember / us-gaap_StatementScenarioAxis = amrn_NonCashMember |  |  |
Warrants Issued October 2009 |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Warrants expiration date |  | Feb. 27, 2015 |  |  |
Increase (Decrease) in the fair value of warrant derivative liability |  | 6,800,000 us-gaap_IncreaseDecreaseInDerivativeLiabilities / us-gaap_ClassOfWarrantOrRightAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember | 47,900,000 us-gaap_IncreaseDecreaseInDerivativeLiabilities / us-gaap_ClassOfWarrantOrRightAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember |  |
Gain (loss) on change in fair value of derivative liability |  | 6,300,000 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_ClassOfWarrantOrRightAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember | 44,200,000 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_ClassOfWarrantOrRightAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember |  |
Compensation expense (income) for change in fair value of warrants issued to former employees |  | $ 500,000 us-gaap_FairValueAdjustmentOfWarrants / us-gaap_ClassOfWarrantOrRightAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember | $ 3,700,000 us-gaap_FairValueAdjustmentOfWarrants / us-gaap_ClassOfWarrantOrRightAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember |  |
Warrants Issued October 2009 | Prior To Agreement |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Warrants expiration date |  | Oct. 16, 2014 |  |  |
Top Three Customers | Gross Product Sales | Customer Concentration Risk |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk percentage |  | 95.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = amrn_TopThreeCustomerMember | 96.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = amrn_TopThreeCustomerMember |  |
Top Three Customers | Accounts Receivable | Customer Concentration Risk |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk percentage |  | 96.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = amrn_TopThreeCustomerMember | 95.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = amrn_TopThreeCustomerMember |  |
Minimum | Embedded Derivative Financial Instruments |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Derivative liability fair value assumptions, term |  | 2 years 3 months 18 days | 3 years 3 months 18 days |  |
Derivative liability fair value assumption, coupon rate |  | 9.80%amrn_FairValueAssumptionsCouponRate / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 9.90%amrn_FairValueAssumptionsCouponRate / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Derivative liability fair value assumptions, market yields |  | 10.00%amrn_FairValueAssumptionsComparableYieldToMaturity / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 9.00%amrn_FairValueAssumptionsComparableYieldToMaturity / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Maximum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Short term highly liquid instruments, maturity date |  | 90 days |  |  |
Maximum | Embedded Derivative Financial Instruments |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Derivative liability fair value assumptions, term |  | 3 years 7 months 6 days | 6 years 7 months 6 days |  |
Derivative liability fair value assumption, coupon rate |  | 10.80%amrn_FairValueAssumptionsCouponRate / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 12.50%amrn_FairValueAssumptionsCouponRate / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Derivative liability fair value assumptions, market yields |  | 16.80%amrn_FairValueAssumptionsComparableYieldToMaturity / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 29.40%amrn_FairValueAssumptionsComparableYieldToMaturity / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

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- Definition Class Of Warrant Expiration Date + References No definition available. + Details
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- Definition Derivative Amount Outstanding + References No definition available. + Details
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- Definition Fair Value Assumptions, Comparable Yield to Maturity + References No definition available. + Details
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- Definition Fair Value Assumptions Coupon Rate + References No definition available. + Details
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- Definition Maturity Period Used to Classify Investments + References No definition available. + Details
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- Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A + 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, expected to be settled within one year or normal operating cycle, if longer. Includes assets 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 -Glossary Current Liabilities -URI http://asc.fasb.org/extlink&oid=6509677 Reference 2: 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 3: 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 4: 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 5: 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 6: 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 + Details
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- Definition Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 + Details
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- Definition Amount of expense (income) related to adjustment to fair value of warrant liability. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 25 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6939902&loc=d3e20148-110875 + Details
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- Definition Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Risk-free interest rate assumption used in valuing an instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- 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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