Property and Equipment, Net - Summary of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 260,078	$ 266,346
Less: Accumulated depreciation	(228,087)	(221,291)
Total property and equipment, net	31,991	45,055
Computer software and web development [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	229,861	229,527
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	23,481	23,738
Building [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	0	5,158
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	4,600	4,600
Furniture, fixtures and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,166	1,166
Computer Software and Web Development Projects In-process [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 970	$ 2,157