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Warrants and Warrant Derivative Liability - Additional Information (Detail) (USD $) | 3 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2015 | Feb. 27, 2015 | Dec. 31, 2014 | Oct. 16, 2009
Derivative [Line Items] |  |  |  |
Common stock issued under private placement, value | $ 52,253,000 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  |
Common stock issued under private placement, net proceeds | 52,800,000 us-gaap_ProceedsFromIssuanceOfPrivatePlacement |  |  |
Warrants expiration date | Feb. 27, 2015 |  |  |
Warrants exercised | 1,844,585 amrn_ClassOfWarrantOrRightExercisedInPeriod |  |  |
Proceed from exercise of warrants | 2,713,000 us-gaap_ProceedsFromWarrantExercises |  |  |
Maximum |  |  |  |
Derivative [Line Items] |  |  |  |
Warrants outstanding |  |  | 8,087,388 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_RangeAxis = us-gaap_MaximumMember |
Prior To Agreement |  |  |  |
Derivative [Line Items] |  |  |  |
Warrants expiration date | Oct. 16, 2014 |  |  |
Warrants Issued October 2009 |  |  |  |
Derivative [Line Items] |  |  |  |
Warrants outstanding | 0 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember |  |  |
Warrants expiration date | Feb. 27, 2015 |  |  |
Warrants exercised | 1,844,585 amrn_ClassOfWarrantOrRightExercisedInPeriod / us-gaap_ClassOfWarrantOrRightAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember |  |  |
Proceed from exercise of warrants | 2,700,000 us-gaap_ProceedsFromWarrantExercises / us-gaap_ClassOfWarrantOrRightAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember |  |  |
Warrants expired |  | 6,242,803 amrn_ClassOfWarrantOrRightExpiredInPeriod / us-gaap_ClassOfWarrantOrRightAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember |  |
Warrants Issued October 2009 | Maximum |  |  |  |
Derivative [Line Items] |  |  |  |
Warrants outstanding |  |  | 8,087,388 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Warrants Issued October 2009 | Prior To Agreement |  |  |  |
Derivative [Line Items] |  |  |  |
Warrants expiration date | Oct. 16, 2014 |  |  |
Warrants Issued July 2009 |  |  |  |
Derivative [Line Items] |  |  |  |
Warrants outstanding | 0 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = amrn_WarrantsIssuedJulyTwentyZeroNineMember |  | 0 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = amrn_WarrantsIssuedJulyTwentyZeroNineMember |
Warrants exercised |  |  | 1,684,888 amrn_ClassOfWarrantOrRightExercisedInPeriod / us-gaap_ClassOfWarrantOrRightAxis = amrn_WarrantsIssuedJulyTwentyZeroNineMember |
Proceed from exercise of warrants |  |  | 1,700,000 us-gaap_ProceedsFromWarrantExercises / us-gaap_ClassOfWarrantOrRightAxis = amrn_WarrantsIssuedJulyTwentyZeroNineMember |
October 2009 Private Placement |  |  |  |
Derivative [Line Items] |  |  |  |
Common stock issued under private placement, value |  |  |  | 70,000,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_SubsidiarySaleOfStockAxis = amrn_OctoberTwentyZeroNinePrivatePlacementMember
Common stock issued under private placement, net proceeds |  |  |  | 62,300,000 us-gaap_ProceedsFromIssuanceOfPrivatePlacement / us-gaap_SubsidiarySaleOfStockAxis = amrn_OctoberTwentyZeroNinePrivatePlacementMember
Common stock issued under private placement, shares |  |  |  | 66,400,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_SubsidiarySaleOfStockAxis = amrn_OctoberTwentyZeroNinePrivatePlacementMember
Number of shares that each ADS represents |  |  |  | 1 amrn_AmericanDepositorySharesToSharesRatio / us-gaap_SubsidiarySaleOfStockAxis = amrn_OctoberTwentyZeroNinePrivatePlacementMember
Common stock issued under private placement, price per share |  |  |  | $ 1.00 us-gaap_EquityIssuancePerShareAmount / us-gaap_SubsidiarySaleOfStockAxis = amrn_OctoberTwentyZeroNinePrivatePlacementMember
October 2009 Private Placement | Warrants issued to three former officers |  |  |  |
Derivative [Line Items] |  |  |  |
Number of warrants issued |  |  |  | 900,000 amrn_ClassOfWarrantOrRightIssued / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_OfficerMember / us-gaap_SubsidiarySaleOfStockAxis = amrn_OctoberTwentyZeroNinePrivatePlacementMember
October 2009 Private Placement | Bridge Loan |  |  |  |
Derivative [Line Items] |  |  |  |
Bridge notes converted in conjunction with the private placement, amount |  |  |  | $ 3,600,000 us-gaap_DebtConversionOriginalDebtAmount1 / us-gaap_LongtermDebtTypeAxis = us-gaap_BridgeLoanMember / us-gaap_SubsidiarySaleOfStockAxis = amrn_OctoberTwentyZeroNinePrivatePlacementMember
Common stock issued under private placement, shares |  |  |  | 4,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_LongtermDebtTypeAxis = us-gaap_BridgeLoanMember / us-gaap_SubsidiarySaleOfStockAxis = amrn_OctoberTwentyZeroNinePrivatePlacementMember
Number of shares that each ADS represents |  |  |  | 1 amrn_AmericanDepositorySharesToSharesRatio / us-gaap_LongtermDebtTypeAxis = us-gaap_BridgeLoanMember / us-gaap_SubsidiarySaleOfStockAxis = amrn_OctoberTwentyZeroNinePrivatePlacementMember
Bridge notes converted in conjunction with the private placement, price per share |  |  |  | $ 0.90 us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_LongtermDebtTypeAxis = us-gaap_BridgeLoanMember / us-gaap_SubsidiarySaleOfStockAxis = amrn_OctoberTwentyZeroNinePrivatePlacementMember
October 2009 Private Placement | Warrants Issued October 2009 |  |  |  |
Derivative [Line Items] |  |  |  |
Number of warrants issued |  |  |  | 35,200,000 amrn_ClassOfWarrantOrRightIssued / us-gaap_ClassOfWarrantOrRightAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember / us-gaap_SubsidiarySaleOfStockAxis = amrn_OctoberTwentyZeroNinePrivatePlacementMember
Description of pricing variability feature and classification of warrants | The warrants issued in connection with the October 2009 financing contained a pricing variability feature which provided for an increase to the exercise price if the exchange rate between the U.S. dollar and British pound adjusts such that the warrants could be exercised at a price less than the £0.5 par value of the common stock - that is, if the exchange rate exceeded U.S. $3.00 per £1.0 sterling. Due to the potential variable nature of the exercise price, the warrants are not considered to be indexed to the Company’s common stock. Accordingly, the warrants do not qualify for the exception to classify the warrants within equity and are classified as a derivative liability. |  |  |
October 2009 Private Placement | Warrants Issued October 2009 | Maximum |  |  |  |
Derivative [Line Items] |  |  |  |
Warrants issued, number of shares called by the warrant | 36,100,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_ClassOfWarrantOrRightAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_SubsidiarySaleOfStockAxis = amrn_OctoberTwentyZeroNinePrivatePlacementMember |  |  |
October 2009 Private Placement | Warrants Issued October 2009 | American Depositary Share |  |  |  |
Derivative [Line Items] |  |  |  |
Warrant term |  |  |  | 5 years
Warrants issued, number of shares called by a warrant |  |  |  | 0.5 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight / us-gaap_ClassOfWarrantOrRightAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember / us-gaap_EnergyAxis = amrn_AmericanDepositaryShareMember / us-gaap_SubsidiarySaleOfStockAxis = amrn_OctoberTwentyZeroNinePrivatePlacementMember
Exercise price of the warrants |  |  |  | $ 1.50 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember / us-gaap_EnergyAxis = amrn_AmericanDepositaryShareMember / us-gaap_SubsidiarySaleOfStockAxis = amrn_OctoberTwentyZeroNinePrivatePlacementMember
October 2009 Private Placement | Warrants Issued October 2009 | Bridge Loan | American Depositary Share |  |  |  |
Derivative [Line Items] |  |  |  |
Warrant term |  |  |  | 5 years
Warrants issued, number of shares called by a warrant |  |  |  | 0.5 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight / us-gaap_ClassOfWarrantOrRightAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember / us-gaap_EnergyAxis = amrn_AmericanDepositaryShareMember / us-gaap_LongtermDebtTypeAxis = us-gaap_BridgeLoanMember / us-gaap_SubsidiarySaleOfStockAxis = amrn_OctoberTwentyZeroNinePrivatePlacementMember
Exercise price of the warrants |  |  |  | $ 1.50 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember / us-gaap_EnergyAxis = amrn_AmericanDepositaryShareMember / us-gaap_LongtermDebtTypeAxis = us-gaap_BridgeLoanMember / us-gaap_SubsidiarySaleOfStockAxis = amrn_OctoberTwentyZeroNinePrivatePlacementMember

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares. + References No definition available. + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 2 -Article 4 + Details
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- Definition The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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