Share Capital - Summary Of Weighted Average Grant Date Fair Value And Intrinsic Value Of Options Exercised (Detail)	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2020 $ / shares	Dec. 31, 2019 USD ($)	Dec. 31, 2019 $ / shares	Dec. 31, 2018 USD ($)	Dec. 31, 2018 $ / shares
Stockholders' Equity Note [Abstract]
Weighted average grant date fair value (per share) of stock option units granted (CAD) | $ / shares		$ 6.58		$ 8.06		$ 10.85
Intrinsic value of stock option units exercised, using market price at exercise date (USD) | $	$ 1,184,089		$ 88,010		$ 31,604