Reconciliation of Statutory Canadian Tax rate to Effective Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Effective Tax Rate Reconciliation [Line Items]
Income Tax Provision (benefit)	$ 4,993	$ 10,207	$ 13,827
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	$ 13,272	$ 17,778	$ 22,079
International tax rate differences	(3,346)	(4,474)	(2,038)
U.S. state income taxes, net of federal benefits	386	831	674
Withholding and other taxes	364	550	484
Permanent differences and other	443	1,015	1,582
Section 199 deduction			(1,148)
Foreign-derived intangible income	(787)	(1,628)
Tax credits	(1,457)	(1,250)	(984)
Statutory tax rate changes	35	(285)	2,823
Uncertain tax positions	310	190	(1,607)
Change in valuation allowance	(482)	(262)	(354)
Acquisition contingent consideration adjustments	287	833	149
Transaction costs	247	172	1,011
Provision to return differences	(516)	(385)	225
Windfall benefit from share-based compensation	(1,717)	(931)	(837)
Gain on Laser Quantum acquisition			(6,586)
U.K. patent box	(2,046)	(1,947)	(1,646)
Income Tax Provision (benefit)	$ 4,993	$ 10,207	$ 13,827
Effective tax rate	10.90%	16.70%	18.20%