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v3.19.1

Development, Commercialization and Supply Agreement - Recognized Revenues Changes in Contract Asset and Contract Liability Balances (Detail) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($)
Revenue recognized in the period from: |
Amounts included in contract liability at the beginning of the period | $ 547

X
- Definition Contract with customer liability revenue recognized excluding performance obligation satisfied in previous period. + References No definition available. + Details
Name: | amrn_ContractWithCustomerLiabilityRevenueRecognizedExcludingPerformanceObligationSatisfiedInPreviousPeriod
Namespace Prefix: | amrn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_ChangeInContractWithCustomerLiabilityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration