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Inventory - Schedule of Inventory (Parenthetical) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Inventory Disclosure [Abstract] |  |  |
Inventory deemed not saleable | $ 8,000 | $ 5,100 |
Cost of goods sold inventory restructuring | $ 36,474 | $ 39,228 | $ 18,078

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- Definition Cost of goods and services sold restructuring inventory. + References No definition available. + Details
Name: | amrn_CostOfGoodsAndServicesSoldRestructuringInventory
Namespace Prefix: | amrn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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

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