XML 48 R56.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Warrants and Warrant Derivative Liability - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | ---
Oct. 31, 2009 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 16, 2009
Derivative [Line Items] |  |  |  |  |
Warrants outstanding |  | 8,087,388 us-gaap_ClassOfWarrantOrRightOutstanding |  |  |
Exercise Price |  | $ 1.50 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 |  |  |
Warrants expiration date | Feb. 27, 2015 |  |  |  |
Proceed from exercise of warrants |  | $ 1,651,000 us-gaap_ProceedsFromWarrantExercises | $ 160,000 us-gaap_ProceedsFromWarrantExercises | $ 16,720,000 us-gaap_ProceedsFromWarrantExercises |
Prior To Agreement |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Warrants expiration date | Oct. 16, 2014 |  |  |  |
Warrants Issued October 2009 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Exercise Price |  | $ 1.50 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember |  |  |
Warrants expiration date |  | Feb. 27, 2015 |  |  |
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 |  |  |
Warrants exercised |  | 1,684,888 amrn_ClassOfWarrantOrRightExercisedInPeriod / us-gaap_ClassOfWarrantOrRightAxis = amrn_WarrantsIssuedJulyTwentyZeroNineMember | 120,000 amrn_ClassOfWarrantOrRightExercisedInPeriod / us-gaap_ClassOfWarrantOrRightAxis = amrn_WarrantsIssuedJulyTwentyZeroNineMember |  |
Proceed from exercise of warrants |  | 1,700,000 us-gaap_ProceedsFromWarrantExercises / us-gaap_ClassOfWarrantOrRightAxis = amrn_WarrantsIssuedJulyTwentyZeroNineMember | 100,000 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] |  |  |  |  |
Exercise Price |  |  |  |  | $ 1.50 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = amrn_WarrantsIssuedOctoberTwentyZeroNineMember / us-gaap_EnergyAxis = amrn_AmericanDepositaryShareMember / us-gaap_SubsidiarySaleOfStockAxis = amrn_OctoberTwentyZeroNinePrivatePlacementMember
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
October 2009 Private Placement | Warrants Issued October 2009 | Bridge Loan | American Depositary Share |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Exercise Price |  |  |  |  | $ 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
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

X
- Definition American Depository Shares to Shares Ratio + References No definition available. + Details
Name: | amrn_AmericanDepositorySharesToSharesRatio
Namespace Prefix: | amrn_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Class Of Warrant Expiration Date + References No definition available. + Details
Name: | amrn_ClassOfWarrantExpirationDate
Namespace Prefix: | amrn_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Class of Warrant or Right, Exercised in Period + References No definition available. + Details
Name: | amrn_ClassOfWarrantOrRightExercisedInPeriod
Namespace Prefix: | amrn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Class of Warrant or Right, Issued + References No definition available. + Details
Name: | amrn_ClassOfWarrantOrRightIssued
Namespace Prefix: | amrn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Class of Warrant or Right, Term + References No definition available. + Details
Name: | amrn_ClassOfWarrantOrRightTerm
Namespace Prefix: | amrn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number 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)) -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 -Article 4 + Details
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | us-gaap_DebtConversionOriginalDebtAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
Name: | us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Identification of the host contract (such as a debt instrument, lease, an agreement to settle payments in other than the functional currency), description of the terms of the contract, and discussion of a hybrid instrument with an embedded feature which is separated from the host contract and accounted for as a derivative. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 15 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=34750511&loc=d3e48542-113965 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 15 -Section 25 -Paragraph 54 -URI http://asc.fasb.org/extlink&oid=34750511&loc=d3e49467-113965 + Details
Name: | us-gaap_EmbeddedDerivativeDescriptionOfHostContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount per share or per unit assigned to the consideration received of equity securities issued for development stage entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 915 -SubTopic 215 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6472370&loc=d3e38297-110927 + Details
Name: | us-gaap_EquityIssuancePerShareAmount
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash inflow associated with the amount received from entity's raising of capital via private rather than public placement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfPrivatePlacement
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow associated with the amount received from holders exercising their stock warrants. + References No definition available. + Details
Name: | us-gaap_ProceedsFromWarrantExercises
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
Name: | us-gaap_StockIssuedDuringPeriodValueNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | amrn_AgreementAxis=amrn_PriorToAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=amrn_WarrantsIssuedJulyTwentyZeroNineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=amrn_WarrantsIssuedOctoberTwentyZeroNineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=amrn_OctoberTwentyZeroNinePrivatePlacementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |