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Share capital (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Schedule of Common Stock Outstanding | The following table presents a summary of the common shares issued and outstanding as of and for the years ended December 31, 2020, 2019 and 2018:
Common shares | 2020 |  | 2019 |  | 2018
Common shares issued, beginning of year | 94,225,498 |  |  | 93,639,610 |  |  | 107,227,347 |
Options exercised | — |  |  | 187,678 |  |  | — |
Restricted shares granted, net of forfeitures | 1,012,939 |  |  | 366,453 |  |  | 50,644 |
Performance restricted shares granted, net of forfeitures and shares withheld | 344,296 |  |  | 31,757 |  |  | 256,106 |
Retirement of treasury shares and shares repurchased (1) | — |  |  | — |  |  | (14,256,043) |
Warrants exercised, net (2) | — |  |  | — |  |  | 361,556 |
Common shares issued, end of year | 95,582,733 |  |  | 94,225,498 |  |  | 93,639,610 |
(1)Prior to December 31, 2017, common shares repurchased by the Company were not canceled and were classified as treasury shares. Effective January 1, 2018, all treasury shares were retired and subsequent shares repurchased are retired. (2)During the year ended December 31, 2018, 1,156,184 warrants were exercised. As a result of the warrant holder electing net settlement, 794,628 of those common shares were withheld by the Company and were subsequently retired, resulting in a net issuance of 361,556 common shares.
Schedule of summary of warrants | The following is a summary of warrants as of December 31, 2020:
| Exercise price |  | Authorized and issued |  | Aggregated fair value of warrants
Founders | $ | 10.00 |  |  | 2,913,684 |  |  | $ | 10,884 |
Advisor | $ | 10.00 |  |  | 581,295 |  |  | 2,171 |
|  |  | 3,494,979 |  |  | $ | 13,055 |

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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 + Details
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