Income Taxes - Reconciliation of Tax Positions (Details) - Canadian Federal - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of the beginning and ending gross amounts of unrecognized tax positions
Unrecognized tax positions, beginning of year	$ 24,817	$ 17,046	$ 12,916
Gross increase — current period tax positions	9,115	7,849	4,130
Gross decrease — current period tax positions	0	0	0
Gross decrease — prior period tax positions	(1,940)	(78)	0
Gross increase — prior period tax positions	0	0	0
Expiration of statute of limitations	0	0	0
Unrecognized tax positions, end of year	$ 31,992	$ 24,817	$ 17,046