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Share capital (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure of classes of share capital [abstract] |
Summary of share capital |
| 2020 |  | 2019
Voting common shares | Number of Shares | Total |  | Number of Shares | Total
Balance at January 1, | 164,963,324 |  | $ | 3,054,563 |  |  | 158,801,722 | $ | 3,007,924 |
Shares issued upon exercise of share options, for cash | 618,915 |  | 3,559 |  |  | 56,644 | 265 |
Estimated fair value of share options exercised transferred from contributed surplus | — |  | 1,267 |  |  | — |  | 103 |
Shares issued to the public | 8,353,042 |  | 76,957 |  |  | 6,104,958 | 48,041 |
Share issuance cost | — |  | (1,570) |  |  | — |  | (1,770) |
Flow-through shares issued, net of costs and premium | 996,100 |  | 9,868 |  |  | — |  | — |
Balance at December 31, | 174,931,381 |  | $ | 3,144,644 |  |  | 164,963,324 |  | $ | 3,054,563 |

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- Definition The disclosure of classes of share capital. [Refer: Share capital [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 79 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_79_a&doctype=Standard -URIDate 2020-01-01 + Details
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