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Equity - Common Stock - Additional Information (Detail) - shares | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Amarin Corporation Plc 2017 Employee Stock Purchase Plan | Ordinary Shares |  |
Stockholders Equity Note [Line Items] |  |
Issuance of common stock under employee stock purchase plan (in shares) | 205,861 | 265,214

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