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Equity - Common Stock - Additional Information (Detail) - shares | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Common Shares |  |
Stockholders Equity Note [Line Items] |  |
Common stock activity during period | 0 | 0

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- Definition Stockholders Equity Note [Line Items] + References No definition available. + Details
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Namespace Prefix: | amrn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The increase (decrease) during the period in the number of shares issued. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21463-112644 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |