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

X

- Definition

Valuation Allowances And Reserves Foreign Currency Translation

+ References

No definition available.

+ Details

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X

- 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

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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

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