Share Capital - Stock Option Activity (Details) - shares		3 Months Ended				6 Months Ended
		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.