Equipment and leasehold improvements (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	$ 34,331	$ 25,979
Less: accumulated depreciation	(16,286)	(10,849)
Equipment and leasehold improvements, net	18,045	15,130
Depreciation expense	5,800	5,200	$ 4,400
Computers
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	14,629	10,529
Software
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	1,182	666
Furniture/fixtures
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	4,394	3,417
Leasehold improvements
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	11,123	10,669
Capital in progress
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	$ 3,003	$ 698

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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