Reconciliation of Statutory Canadian Tax rate to Effective Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Effective Tax Rate Reconciliation [Line Items]
Income Tax Provision (benefit)	$ 3,882	$ 4,993	$ 10,207
Canada Revenue Agency
Schedule Of Effective Tax Rate Reconciliation [Line Items]
Statutory Canadian tax rate	29.00%	29.00%	29.00%
Expected income tax provision at Canadian statutory tax rate	$ 14,037	$ 13,272	$ 17,778
International tax rate differences	(3,483)	(3,346)	(4,474)
U.S. state income taxes, net	(108)	386	831
Withholding and other taxes	485	364	550
Permanent differences and other	259	443	1,015
Disallowed compensation	685
Foreign-derived intangible income	(1,063)	(787)	(1,628)
Tax credits	(2,016)	(1,457)	(1,250)
Statutory tax rate changes	429	35	(285)
Uncertain tax positions	(176)	310	190
Change in valuation allowance	(727)	(482)	(262)
Acquisition contingent consideration adjustments	(1,513)	287	833
Transaction costs	(23)	247	172
Provision to return differences	750	(516)	(385)
Windfall benefit from share-based compensation	(2,322)	(1,717)	(931)
UK patent box	(1,332)	(2,046)	(1,947)
Income Tax Provision (benefit)	$ 3,882	$ 4,993	$ 10,207
Effective tax rate	8.00%	10.90%	16.70%