XML 17 R39.htm IDEA: XBRL DOCUMENT v3.2.0.727

Co-Promotion Agreement - Additional Information (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2015 USD ($) Employee	Dec. 31, 2014 USD ($)
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	$ 13,006	$ 8,525
Kowa Pharmaceuticals America
Co-Promotion Agreement [Line Items]
Net receivable		$ 600
Net payables	$ 1,500
Kowa Pharmaceuticals America | Minimum
Co-Promotion Agreement [Line Items]
Number of sales representatives | Employee	250

X

- Definition

Co-Promotion Agreement [Line Items]

+ References

No definition available.

+ Details

Name:	amrn_CoPromotionAgreementLineItems
Namespace Prefix:	amrn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number Of Sales Representative

+ References

No definition available.

+ Details

Name:	amrn_NumberOfSalesRepresentative
Namespace Prefix:	amrn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Range of Percentage of Gross Margin Payable for Co-Promotion Agreement

+ References

No definition available.

+ Details

Name:	amrn_RangeOfPercentageOfGrossMarginPayableForCoPromotionAgreement
Namespace Prefix:	amrn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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 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

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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 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 2: 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



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 02



-Paragraph 3



-Article 5

+ Details

Name:	us-gaap_AccountsReceivableNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	amrn_MarketingAgreementAxis=amrn_KowaPharmaceuticalsAmericaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: