Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Computed taxes at Canadian tax rate	$ 57,368	$ 48,627	$ 39,453
Non-deductible expenses	(1,026)	(9,191)	(13,020)
Difference between domestic and foreign tax rate	(345)	185	104
Effect of change in tax rates	0	0	(10)
Adjustments to prior year	(33)	(441)	(39)
Change in valuation allowance	(60,260)	(48,411)	(29,057)
Share issuance costs in equity	2	5,385	3,578
Change in recognition and measurement of tax positions	0	0	(2,391)
Changes due to SR&ED and research credits	5,096	4,067	2,200
Other	(286)	(650)	(236)
Income tax recovery (expense)	$ 516	$ (429)	$ 582

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