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v3.23.2

Co-Promotion Agreement - Additional Information (Detail) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Co Promotion Agreement [Line Items] |  |
Accrued expenses and other current liabilities | $ 214,598 | $ 192,678

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- Definition Accrued liabilities and other liabilities current. + References No definition available. + Details
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Namespace Prefix: | amrn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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