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Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Property, Plant, and Equipment [Line Items]    
Total property and equipment $ 135,382 $ 99,922
Less: accumulated depreciation (73,757) (55,501)
Property and equipment, net 61,625 44,421
Internal-use software and platform development    
Property, Plant, and Equipment [Line Items]    
Total property and equipment 111,744 83,461
Leasehold improvements    
Property, Plant, and Equipment [Line Items]    
Total property and equipment 13,979 7,755
Computer equipment and software    
Property, Plant, and Equipment [Line Items]    
Total property and equipment 8,136 7,630
Office furniture and fixtures    
Property, Plant, and Equipment [Line Items]    
Total property and equipment $ 1,523 $ 1,076