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Share Capital - Stock Option Activity (Details) - shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |  |  |  |  |
Number of Options Outstanding, Beginning balance |  | 5,742,608 | 4,758,997 | 4,527,992 | 3,534,236 | 4,758,997 | 3,534,236
Number of Options, Granted |  | 382,500 |  | 127,300 |  | 1,494,450 | 1,245,650
Number of Options, Exercised | [1] | (222,331) |  | (54,716) |  | (344,734) | (153,042)
Number of Options, Forfeited, cancelled or expired |  | (131,726) |  | (5,144) |  | (137,662) | (31,412)
Number of Options Outstanding, Ending balance |  | 5,771,051 | 5,742,608 | 4,595,432 | 4,527,992 | 5,771,051 | 4,595,432
Number of Options Exercisable, End of period |  | 2,842,948 |  | 2,114,647 |  | 2,842,948 | 2,114,647
[1] | During the six months ended June 30, 2021, 58,179 (six months ended June 30, 2020 – 10,715) stock options were exercised for the same number of common shares in exchange for cash. In the same period, the Company issued 179,129 (six months ended June 30, 2020 – 85,660) common shares for the cashless exercise of 286,555 (six months ended June 30, 2020 – 142,327) stock options.

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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