Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Property Plant And Equipment [Line Items]
Total property and equipment	$ 218,486	$ 201,277
Accumulated depreciation and amortization	(57,942)	(46,080)
Property and equipment, net	160,544	155,197
Computer and Equipment
Property Plant And Equipment [Line Items]
Total property and equipment	34,600	30,859
Leasehold Improvements
Property Plant And Equipment [Line Items]
Total property and equipment	156,664	144,013
Website and Internal-Use Software
Property Plant And Equipment [Line Items]
Total property and equipment	7,319	6,744
Office Equipment and Furniture
Property Plant And Equipment [Line Items]
Total property and equipment	$ 19,903	$ 19,661