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Equity - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended | 1 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 11, 2014 | Jan. 08, 2014 | Jan. 31, 2013
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Refund of equity issuance costs | $ 3,191 amrn_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCostsRefund |  |  |  |  |
Shares issued, exercise of stock options | 234,500 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 386,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |  |  |
Proceeds from exercise of stock options, net of transaction costs | 307 us-gaap_ProceedsFromStockOptionsExercised | 627 us-gaap_ProceedsFromStockOptionsExercised | 8,205 us-gaap_ProceedsFromStockOptionsExercised |  |  |
Shares issued, exercise of warrants | 1,684,888 amrn_StockIssuedDuringPeriodSharesStockWarrantsExercised | 147,050 amrn_StockIssuedDuringPeriodSharesStockWarrantsExercised |  |  |  |
Proceeds from exercise of warrants, net of transaction costs | $ 1,651 us-gaap_ProceedsFromWarrantExercises | $ 160 us-gaap_ProceedsFromWarrantExercises | $ 16,720 us-gaap_ProceedsFromWarrantExercises |  |  |
Stock options, Granted | 3,271,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod |  |  |  |  |
Stock Incentive Plan 2011 |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Stock options, Granted |  |  |  | 205,890 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_PlanNameAxis = amrn_StockIncentivePlanTwentyElevenMember | 2,605,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_PlanNameAxis = amrn_StockIncentivePlanTwentyElevenMember |
Stock options, Vesting Period | 4 years |  |  |  |  |
Stock Incentive Plan 2011 | Group 2 |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Restricted stock units, issued as a result of vesting |  | 0 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_PlanNameAxis = amrn_StockIncentivePlanTwentyElevenMember / us-gaap_StatementScenarioAxis = amrn_Group2Member |  |  |  |
Stock Incentive Plan 2011 | Restricted Stock Units (RSUs) |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Stock units, Granted |  |  |  | 173,348 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = amrn_StockIncentivePlanTwentyElevenMember | 2,082,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = amrn_StockIncentivePlanTwentyElevenMember | 454,875 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = amrn_StockIncentivePlanTwentyElevenMember
Stock options, Vesting Period |  |  |  |  | 3 years |
Stock Incentive Plan 2011 | Stock Options |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Stock options, Vesting Period |  |  |  |  | 4 years |

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- Definition Amount of increase in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. + References No definition available. + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + 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 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: 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
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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