XML 52 R39.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Co-Promotion Agreement - Additional Information (Detail) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Co Promotion Agreement [Line Items] |  |
Accrued expenses and other current liabilities | $ 49,102 | $ 37,720
Co-Promotion Agreement (the Agreement) |  |
Co Promotion Agreement [Line Items] |  |
Promotion fee as a percentage of gross margin | 18.00% |
Promotion fee as a percentage gross margin | scheduled, as amended, to be approximately eighteen percent (18%) in 2017, partially offset by certain other refinements |
Co-Promotion Agreement (the Agreement) | Kowa Pharmaceuticals America |  |
Co Promotion Agreement [Line Items] |  |
Agreement amended date | Jul. 25, 2017 |
Accrued expenses and other current liabilities | $ 12,300 | $ 2,500

X
- Definition Agreement amended date. + References No definition available. + Details
Name: | amrn_AgreementAmendedDate
Namespace Prefix: | amrn_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Co-promotion agreement. + References No definition available. + Details
Name: | amrn_CoPromotionAgreementLineItems
Namespace Prefix: | amrn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of gross margin, payable for promotion agreement. + References No definition available. + Details
Name: | amrn_PercentageOfGrossMarginPayableForPromotionAgreement
Namespace Prefix: | amrn_
Data Type: | num:percentItemType
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 Amount of expenses incurred but not yet paid nor invoiced, and liabilities classified as other. + References No definition available. + Details
Name: | us-gaap_AccruedLiabilitiesAndOtherLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=amrn_CoPromotionAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CounterpartyNameAxis=amrn_KowaPharmaceuticalsAmericaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |