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Equity | 12 Months Ended
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Dec. 31, 2022
Equity [Abstract] |
Equity | (8) Equity Common Stock On July 13, 2022, in connection with the United Kingdom's National Institute for Health and Care Excellence, or NICE's, final guidance for reimbursement of VAZKEPA and use across the National Health Service, or NHS, in England and Wales, representing receipt of marketing approval in Europe for the first indication for VAZKEPA, the Company became obligated to make an aggregate milestone payment of £7.5 million to Laxdale's former shareholders (in either stock or cash at the election of each shareholder) under the 2004 purchase agreement among the Company and such former shareholders. One of the shareholders elected to receive payment in stock for its pro rata portion of the milestone payment, resulting in the issuance of 5,817,942 shares at a price of $1.41 per share in July 2022. During the years ended December 31, 2022 and 2021, other than as described elsewhere in this Annual Report on Form 10-K, including in the Notes to Consolidated Financial Statements, the Company did not engage in any transactions involving its common stock. Refer to Incentive Equity Awards below for discussion of ordinary shares issued as a result of stock option exercises and the vesting of restricted stock units. Refer to Note 9—Stock Incentive Plans and Stock Based Compensation for discussion of shares issued under the Company’s employee stock purchase plan. Incentive Equity Awards The Company issues incentive equity awards, including incentive and non-qualified stock options and restricted stock units, under the Amarin Corporation plc 2020 Stock Incentive Plan, or the 2020 Plan, which is the successor to the Amarin Corporation plc 2011 Stock Incentive Plan, as amended, or the 2011 Plan, and the Amarin Corporation plc 2002 Stock Option Plan, as amended, or the 2002 Plan, and together with the 2020 Plan and 2011 Plan, the Plans. Refer to Note 9—Stock Incentive Plans and Stock Based Compensation for further information regarding the Company’s incentive equity plans and awards. The following table summarizes the aggregate number of stock options and restricted stock units, or RSUs, outstanding under the 2020 Plan as of December 31, 2022:
| December 31, 2022 |
Outstanding stock options |  | 19,182,111 |
% of outstanding shares on a fully diluted basis |  | 4 | %
Outstanding RSUs |  | 14,461,050 |
% of outstanding shares on a fully diluted basis |  | 3 | %
The following table represents equity awards activity during the years ended December 31, 2022 and 2021:
| For the Year Ended December 31, |
| 2022 |  |  | 2021 |
Common shares issued for stock option exercises |  | 33,303 |  |  |  | 1,203,845 |
Gross and net proceeds from stock option exercises | $ | 59,686 |  |  | $ | 2,921,000 |
Common shares issued in settlement of vested RSUs |  | 1,940,371 |  |  |  | 1,203,845 |
Shares retained for settlement of employee tax obligations ─ RSUs |  | 500,064 |  |  |  | 782,917 |
Common shares issued in settlement of vested Performance-Based RSUs (1) |  | — |  |  |  | 1,923,316 |
Shares retained for settlement of employee tax obligations ─ Performance-Based RSUs |  | — |  |  |  | 816,931 |
(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. During the years ended December 31, 2022 and 2021, the Company granted a total of 3,065,000 and 4,535,117 stock options, respectively, and 9,069,500 and 5,497,700 RSUs, respectively, to employees under the Plans. The RSUs typically vest annually over a three- or four-year period and the stock options typically vest quarterly over a four-year period. Also during 2022 and 2021, the Company granted a total of 1,919,500 and 2,008,800 RSUs, respectively, to employees under the Plans that vest upon the achievement of specified performance conditions. In addition, during the years ended December 31, 2022 and 2021, the Company granted a total of 1,973,124 and 278,271 stock options, respectively, and 1,597,955 and 218,000 RSUs, respectively, to members of the Company’s Board of Directors under the Plans. The RSUs vest in equal installments over a three-year period upon the earlier of the anniversary of the grant date or the Company’s annual general meeting of shareholders in such anniversary year. The stock options vest in full upon the earlier of the one-year anniversary of the grant date or the Company’s annual general meeting of shareholders in such anniversary year. Upon termination of service to the Company or upon a change of control, each director shall be entitled to a payment equal to the fair market value of one share of Amarin common stock per award vested or granted, respectively, which is required to be made in shares.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI https://asc.fasb.org/topic&trid=2208762 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496171-112644 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496171-112644 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496189-112644 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (g) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496189-112644 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496171-112644 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496189-112644 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 16 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496180-112644 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 40 -Section 50 -Paragraph 6 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126731327&loc=SL126733271-114008 + Details
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