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v2.4.1.9

(Benefit) Expense from Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Current: |  |  |
Federal-U.S. | $ 660 us-gaap_CurrentFederalTaxExpenseBenefit | $ 122 us-gaap_CurrentFederalTaxExpenseBenefit | $ 10,265 us-gaap_CurrentFederalTaxExpenseBenefit
State-U.S. | 117 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 118 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 2,565 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total Current | 777 us-gaap_CurrentIncomeTaxExpenseBenefit | 240 us-gaap_CurrentIncomeTaxExpenseBenefit | 12,830 us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred: |  |  |
Federal-U.S. | (3,689)us-gaap_DeferredFederalIncomeTaxExpenseBenefit | (4,065)us-gaap_DeferredFederalIncomeTaxExpenseBenefit | (2,803)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State-U.S. | (226)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 631 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | (911)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Change in valuation allowance | (3,034)us-gaap_ValuationAllowancesAndReservesPeriodIncreaseDecrease | 33,106 us-gaap_ValuationAllowancesAndReservesPeriodIncreaseDecrease | 22,515 us-gaap_ValuationAllowancesAndReservesPeriodIncreaseDecrease
Total Deferred | (3,614)us-gaap_DeferredIncomeTaxExpenseBenefit | (3,434)us-gaap_DeferredIncomeTaxExpenseBenefit | (3,714)us-gaap_DeferredIncomeTaxExpenseBenefit
Benefit from (provision for) income taxes | (2,837)us-gaap_IncomeTaxExpenseBenefit | (3,194)us-gaap_IncomeTaxExpenseBenefit | 9,116 us-gaap_IncomeTaxExpenseBenefit
Republic of Ireland and the United Kingdom |  |  |
Deferred: |  |  |
Ireland and United Kingdom | $ 3,335 us-gaap_DeferredForeignIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = amrn_IrelandAndUnitedKingdomMember | $ (33,106)us-gaap_DeferredForeignIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = amrn_IrelandAndUnitedKingdomMember | $ (22,515)us-gaap_DeferredForeignIncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = amrn_IrelandAndUnitedKingdomMember

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- Definition Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 + Details
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