Equipment and Leasehold Improvements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Equipment and Leasehold Improvements
Total cost	$ 99,378	$ 95,227
Less accumulated depreciation and amortization	92,297	90,687
Equipment and leasehold improvements, net	7,081	4,540
Depreciation and amortization	5,830	11,505	$ 7,840
Software
Equipment and Leasehold Improvements
Total cost	62,491	58,896
Computer equipment
Equipment and Leasehold Improvements
Total cost	20,863	20,307
Leasehold improvements
Equipment and Leasehold Improvements
Total cost	8,264	8,264
Other equipment
Equipment and Leasehold Improvements
Total cost	3,132	3,132
Furniture and fixtures
Equipment and Leasehold Improvements
Total cost	$ 4,628	$ 4,628