Equipment and leasehold improvements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	$ 42,501	$ 40,848
Less: accumulated depreciation	(27,317)	(21,427)
Equipment and leasehold improvements, net	15,184	19,421
Depreciation expense	7,400	6,700	$ 5,800
Computers
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	19,494	18,191
Software
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	2,352	2,168
Furniture/fixtures
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	4,934	5,162
Leasehold improvements
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	13,658	13,769
Capital in progress
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	$ 2,063	$ 1,558