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Inventory - Schedule of Inventory (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Inventory Disclosure [Abstract] |  |
Inventory deemed not saleable | $ 1.5 |
Finished goods deemed not saleable |  | $ 2.3

X
- Definition Finished goods deemed not saleable + References No definition available. + Details
Name: | amrn_FinishedGoodsDeemedNotSaleable
Namespace Prefix: | amrn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Inventory deemed not saleable. + References No definition available. + Details
Name: | amrn_InventoryDeemedNotSaleable
Namespace Prefix: | amrn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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