Share Capital - Stock Option Activity (Details) - shares		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Options Outstanding, Beginning balance		5,771,051	4,595,432	4,758,997	3,534,236
Number of Options, Granted		236,200	194,400	1,730,650	1,440,050
Number of Options, Exercised	[1]	(41,974)	(375)	(386,708)	(153,417)
Number of Options, Forfeited, cancelled or expired		(45,843)	(3,363)	(183,505)	(34,775)
Number of Options Outstanding, Ending balance		5,919,434	4,786,094	5,919,434	4,786,094
Number of Options Exercisable, End of period		3,068,278	2,324,090	3,068,278	2,324,090

[1] During the nine months ended September 30, 2021, 61,072 stock options were exercised for the same number of common shares in exchange for cash (nine months ended September 30, 2020 – 10,715). In the same period, the Company issued 196,206 common shares (nine months ended September 30, 2020 – 85,816) for the cashless exercise of 325,636 stock options (nine months ended September 30, 2020 – 142,702).