v3.26.3
Stock-based compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 06, 2025
Sep. 30, 2026
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Stock-based compensation     $ 43,100 $ 59,100 $ 148,527 $ 506,763
Capitalized stock-based compensation expense related to internally developed software $ 62,700   $ 10,600 $ 9,200 $ 33,800 $ 77,600
Unvested options outstanding (in shares)   7,000,000.0 7,000,000.0   7,000,000.0  
Share-based payment arrangement, expense $ 423,800          
Shares withheld for tax withholding requirements (in shares) 4,000,000.0          
Employee Stock Option            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Expiration period of stock options granted (in years)         10 years  
Stock Options            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Weighted-average period of recognition (in years)         2 years 3 months 18 days  
Restricted Stock Units            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Weighted-average period of recognition (in years)         3 years  
Share-based payment arrangement, expense         $ 423,800  
Capitalized costs   $ 62,700 $ 62,700   62,700  
Unrecognized stock-based compensation cost related to outstanding   358,200 358,200   $ 358,200  
Awards Associated With Business Combinations            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Weighted-average period of recognition (in years)         1 year 3 months 18 days  
Unrecognized stock-based compensation cost related to outstanding   21,200 21,200   $ 21,200  
ESPP            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Weighted-average period of recognition (in years)         4 months 24 days  
Unrecognized stock-based compensation cost related to outstanding   $ 2,000 $ 2,000   $ 2,000  
Shares withheld for tax withholding requirements (in shares)         1,300,000  
ESPP | Class A common stock            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Issuance of common stock under employee stock purchase plan (in shares)   73,538        
Weighted average purchase price per share (in dollars per share)   $ 87.75 $ 87.75   $ 87.75  
Minimum | Employee Stock Option            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Vesting period         12 months  
Maximum | Employee Stock Option            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Vesting period         48 months