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Equity (Tables) | 9 Months Ended
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Sep. 30, 2023
Equity [Abstract] |
Summarizes the Aggregate Number of Stock Options And Restricted Stock Unit | The following table summarizes the aggregate number of stock options and restricted stock units, or RSUs, outstanding under the Amarin Corporation plc 2020 Stock Incentive Plan, or the 2020 Plan, as of September 30, 2023:
| September 30, 2023 |
Outstanding stock options |  | 27,796,736 |
% of outstanding shares on a fully-diluted basis |  | 6 | %
Outstanding RSUs |  | 13,676,317 |
% of outstanding shares on a fully-diluted basis |  | 3 | %
Summary of Euity Awards Activity | The following table represents equity awards activity during the nine months ended September 30, 2023 and 2022:
| Nine months ended September 30, |
| 2023 |  |  | 2022 |
Common shares issued for stock option exercises |  | 1,239,763 |  |  |  | 33,303 |
Gross and net proceeds from stock option exercises | $ | 1,878,000 |  |  | $ | 59,000 |
Common shares issued in settlement of vested RSUs |  | 3,624,207 |  |  |  | 1,458,806 |
Shares retained for settlement of employee tax obligations ─ RSUs |  | 1,063,987 |  |  |  | 344,318 |
Common shares issued in settlement of vested Performance-based RSUs (1) |  | 342,040 |  |  |  | — |
Shares retained for settlement of employee tax obligations ─ Performance-based RSUs |  | 143,120 |  |  |  | — |
(1) Performance-based RSUs vested in connection with the achievement of certain performance conditions during the year. These performance-based RSUs will vest over a three-year period based on continuous service from the grant date.

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