Share Capital - Share-based Payment Arrangement, Option, Activity (Detail) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Balance	5,664,406
Number of Share, Granted	1,303,143
Number of Shares, Exercised	(699,265)
Number of Shares, Forfeited	(642,623)
Number of Share, Vested	3,335,293
Number of Shares, Ending Balance	5,625,661	5,664,406
Number of Share, Exercisable	2,396,807
Weighted Average Exercise Price, Balance	$ 11.91
Weighted Average Exercise Price, Granted	37.44
Weighted Average Exercise Price, Exercised	13.13
Weighted Average Exercise Price, Forfeited	14.43
Weighted Average Exercise Price, Vested	12.66
Weighted Average Exercise Price, Ending Balance	17.38	$ 11.91
Weighted Average Exercise Price, Exercisable	$ 12.41
Weighted Average Contractual Life, Balance	3 years 8 months 23 days	4 years 4 months 20 days
Weighted Average Contractual Life, Granted	4 years 3 months 3 days
Weighted Average Contractual Life, Exercisable	3 years 7 months 28 days
Aggregate Intrinsic Value, Balance	$ 78,129,641	$ 85,408,034
Aggregate Intrinsic Value, Exercised	13,566,825
Aggregate Intrinsic Value, Exercisable	$ 41,611,631