Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization	$ (89,275)	$ (76,597)
Property and equipment, net	$ 46,431	54,939
Minimum
Property, Plant and Equipment [Line Items]
Useful Lives (years)	3 years
Maximum
Property, Plant and Equipment [Line Items]
Useful Lives (years)	5 years
Property and equipment, gross
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 130,160	124,709
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	28,789	32,262
Website and software development costs
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 75,573	62,963
Website and software development costs | Minimum
Property, Plant and Equipment [Line Items]
Useful Lives (years)	3 years
Website and software development costs | Maximum
Property, Plant and Equipment [Line Items]
Useful Lives (years)	5 years
Computer and office equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 16,175	19,702
Computer and office equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful Lives (years)	3 years
Computer and office equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful Lives (years)	5 years
Software
Property, Plant and Equipment [Line Items]
Useful Lives (years)	3 years
Property and equipment, gross	$ 1,869	1,871
Furniture
Property, Plant and Equipment [Line Items]
Useful Lives (years)	7 years
Property and equipment, gross	$ 7,754	7,911
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 5,546	$ 6,827