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Redeemable Convertible Preferred Stock, Redeemable Common Stock, and Stockholders’ Equity (Deficit) - Schedule of Stock-Based Compensation Expense (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total stock-based compensation expense $ 144,431,000 $ 7,617,000 $ 473,409,000 $ 23,466,000
Capitalized stock-based compensation expense 12,000,000 2,000,000 43,000,000 6,000,000
Software        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total stock-based compensation expense 0   177,000,000  
Capitalized stock-based compensation expense 0   17,000,000  
Cost of revenue        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total stock-based compensation expense 3,533,000 271,000 8,927,000 1,009,000
Technology and infrastructure        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total stock-based compensation expense 52,623,000 2,161,000 154,905,000 6,598,000
Sales and marketing        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total stock-based compensation expense 9,810,000 847,000 21,124,000 2,562,000
General and administrative        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total stock-based compensation expense $ 78,465,000 $ 4,338,000 $ 288,453,000 $ 13,297,000