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Equity (Tables) | 3 Months Ended
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Mar. 31, 2022
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 March 31, 2022:
| March 31, 2022 |
Outstanding stock options |  | 19,639,003 |
% of outstanding shares on a fully diluted basis |  | 5 | %
Outstanding RSUs |  | 15,369,386 |
% of outstanding shares on a fully diluted basis |  | 4 | %
Summary of Equity Awards Activity | The following table represents equity awards activity during the three months ended March 31, 2022 and 2021:
| For the Three Months Ended March 31, |
| 2022 |  |  | 2021 |
Common shares issued for stock option exercises |  | 10,602 |  |  |  | 783,320 |
Gross and net proceeds from stock option exercises | $ | 30,000 |  |  | $ | 2,059,000 |
Common shares issued in settlement of vested RSUs |  | 493,381 |  |  |  | 940,977 |
Shares retained for settlement of employee tax obligations ─ RSUs |  | 161,083 |  |  |  | 365,463 |
Common shares issued in settlement of vested Performance-Based RSUs (1) |  | — |  |  |  | 1,506,428 |
Shares retained for settlement of employee tax obligations ─ Performance-Based RSUs |  | — |  |  |  | 638,502 |
(1) Performance-based RSUs vested in connection with the achievement of certain regulatory and sales performance conditions associated with the REDUCE-IT clinical trial and subsequent revenue growth. These performance-based RSUs have fully vested as of August 2021.

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