Share Capital - Summary Of Weighted Average Grant Date Fair Value And Intrinsic Value Of Options Exercised (Detail) - USD ($)	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020
Stockholders' Equity Note [Abstract]
Weighted average grant date fair value (per share) of stock option units granted (CAD)	$ 14.89	$ 4.46
Intrinsic value of stock option units exercised, using market price at exercise date (USD)	$ 13,566,825	$ 194,247

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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 (d)(2)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration