Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization	$ (83,572)	$ (76,788)
Property and equipment, net	52,551	55,105
Property and equipment, gross
Property, Plant and Equipment [Line Items]
Property and equipment, gross	128,520	125,066
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	32,249	32,285
Website and software development costs
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 66,210	62,963
Website and software development costs | Minimum
Property, Plant and Equipment [Line Items]
Useful Lives (Years)	2 years
Website and software development costs | Maximum
Property, Plant and Equipment [Line Items]
Useful Lives (Years)	3 years
Computer and office equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 20,158	20,036
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	$ 1,858	1,871
Furniture
Property, Plant and Equipment [Line Items]
Useful Lives (Years)	7 years
Property and equipment, gross	$ 8,045	7,911
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 7,603	$ 6,827