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Equity - Common Stock - Additional Information (Detail) € in Millions |  | 9 Months Ended |
--- | --- | --- | ---
Jul. 13, 2022 EUR (€) shares | Sep. 30, 2022 shares | Sep. 30, 2021 shares | Jul. 13, 2022 $ / shares
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) |  | 265,214 | 226,402 |
Food and Drug Administration |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |
Milestone payment | € | € 7.5 |  |  |
Stock issuance of shares | 5,817,942 |  |  |
Sale of stock per share | $ / shares |  |  |  | $ 1.41

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