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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