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v2.4.1.9

Valuation Allowance (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Valuation Allowance [Line Items] |  |
Beginning valuation allowance | $ 88,999 us-gaap_DeferredTaxAssetsValuationAllowance | $ 55,894 us-gaap_DeferredTaxAssetsValuationAllowance
Increase as reflected in income tax expense | 5,081 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 32,999 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Cumulative translation adjustment | (8,115)amrn_ValuationAllowancesAndReservesForeignCurrencyTranslation | 106 amrn_ValuationAllowancesAndReservesForeignCurrencyTranslation
Ending valuation allowance | $ 85,965 us-gaap_DeferredTaxAssetsValuationAllowance | $ 88,999 us-gaap_DeferredTaxAssetsValuationAllowance

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- Definition Valuation Allowances And Reserves Foreign Currency Translation + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: 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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- Details
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