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Co-Promotion Agreement - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Co-Promotion Agreement [Line Items] |
Promotion fee as a percentage gross margin | From the high single digits in 2014 to the low twenty percent levels in 2018.
Kowa Pharmaceuticals America |
Co-Promotion Agreement [Line Items] |
Net receivable | 0.6 us-gaap_AccountsReceivableNet / amrn_MarketingAgreementAxis = amrn_KowaPharmaceuticalsAmericaMember
Kowa Pharmaceuticals America | Minimum |
Co-Promotion Agreement [Line Items] |
Number of sales representatives | 250 amrn_NumberOfSalesRepresentative / amrn_MarketingAgreementAxis = amrn_KowaPharmaceuticalsAmericaMember / us-gaap_RangeAxis = us-gaap_MinimumMember

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- Definition Range of Percentage of Gross Margin Payable for Co-Promotion Agreement + References No definition available. + Details
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- Definition For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.9) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.5) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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