Share Capital - Stock Option Activity (Details) - shares		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Options Outstanding, Beginning balance		4,758,997	3,534,236
Number of Options, Granted		1,111,950	1,118,350
Number of Options, Exercised	[1]	(122,403)	(98,326)
Number of Options, Forfeited, cancelled or expired		(5,936)	(26,268)
Number of Options Outstanding, Ending balance		5,742,608	4,527,992
Number of Options Exercisable, End of period		2,769,438	1,992,705

[1] During the three months ended March 31, 2021, 46,296 (2020 – 1,972) stock options were exercised for the same number of common shares in exchange for cash. In the same period, the Company issued 36,159 (2020 – 55,885) common shares for the cashless exercise of 76,107 (2020 – 96,354) stock options.