Equipment and Leasehold Improvements (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property, plant and equipment
Total cost	$ 89,470	$ 88,630
Less accumulated depreciation and amortization	71,342	65,188
Equipment and leasehold improvements, net	18,128	23,442
Depreciation and amortization	7,876	6,896	$ 7,526
Software
Property, plant and equipment
Total cost	58,079	57,463
Computer equipment
Property, plant and equipment
Total cost	15,649	15,425
Leasehold improvements
Property, plant and equipment
Total cost	8,264	8,264
Other equipment
Property, plant and equipment
Total cost	3,132	3,132
Furniture and fixtures
Property, plant and equipment
Total cost	$ 4,346	$ 4,346

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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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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