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Co-Promotion Agreement - Additional Information (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | 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. |
Net payables | $ 10,756,000 us-gaap_AccountsPayableCurrent | $ 8,525,000 us-gaap_AccountsPayableCurrent
Kowa Pharmaceuticals America |  |
Co-Promotion Agreement [Line Items] |  |
Net receivable | 600,000 us-gaap_AccountsReceivableNet / amrn_MarketingAgreementAxis = amrn_KowaPharmaceuticalsAmericaMember | 600,000 us-gaap_AccountsReceivableNet / amrn_MarketingAgreementAxis = amrn_KowaPharmaceuticalsAmericaMember
Net payables | $ 700,000 us-gaap_AccountsPayableCurrent / amrn_MarketingAgreementAxis = amrn_KowaPharmaceuticalsAmericaMember | $ 700,000 us-gaap_AccountsPayableCurrent / 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 Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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