Computer Hardware and Other Property, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Total computer hardware and other property	$ 48,509		$ 41,528
Accumulated depreciation	(25,556)		(23,486)
Total computer hardware and other property, net	22,953		18,042
Depreciation	2,329	$ 2,051
Computer hardware
Property, Plant and Equipment [Line Items]
Total computer hardware and other property	26,982		24,620
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total computer hardware and other property	15,352		12,496
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Total computer hardware and other property	$ 6,175		$ 4,412