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v2.4.1.9

Difference between (Benefit) Expense from Income Taxes and Amount Computed by Applying Statutory Income Tax Rate to Income Before Taxes (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Taxes [Line Items] |  |  |
Benefits from taxes at statutory rate | $ (14,786)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ (42,355)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ (42,517)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Rate differential | 9,493 us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | 18,494 us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | 13,249 us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Change in valuation reserves | (3,034)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 33,106 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 22,515 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Warrant derivative liabilities | (2,706)amrn_IncomeTaxReconciliationDerivativeLiabilities | (11,984)amrn_IncomeTaxReconciliationDerivativeLiabilities | 8,904 amrn_IncomeTaxReconciliationDerivativeLiabilities
Gain on extinguishment of debt | (9,509)amrn_IncomeTaxReconciliationGainLossOnExtinguishmentOfDebt |  |
Research and development credits | (1,455)us-gaap_IncomeTaxReconciliationTaxCreditsResearch | (2,008)us-gaap_IncomeTaxReconciliationTaxCreditsResearch | (48)us-gaap_IncomeTaxReconciliationTaxCreditsResearch
Tax return to provision adjustments | 10,026 us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate | 125 us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate | 375 us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Cumulative translation adjustment | 8,061 amrn_IncomeTaxRateReconciliationCumulativeTranslationAdjustmentAmount | (280)amrn_IncomeTaxRateReconciliationCumulativeTranslationAdjustmentAmount |
Permanent and other | 1,073 us-gaap_IncomeTaxReconciliationOtherAdjustments | 1,708 us-gaap_IncomeTaxReconciliationOtherAdjustments | 6,638 us-gaap_IncomeTaxReconciliationOtherAdjustments
Benefit from (provision for) income taxes | $ (2,837)us-gaap_IncomeTaxExpenseBenefit | $ (3,194)us-gaap_IncomeTaxExpenseBenefit | $ 9,116 us-gaap_IncomeTaxExpenseBenefit

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + 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.(h)) -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 h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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