v3.25.2
Stockholders’ Deficit - Common stock and preferred stock (Narrative) (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2017
shares
Jun. 30, 2025
$ / shares
shares
Jun. 30, 2024
shares
Jun. 30, 2025
vote
$ / shares
shares
Jun. 30, 2024
shares
Dec. 31, 2024
shares
Class of Stock [Line Items]            
Preferred stock, shares authorized (in shares)   240,000,000.0   240,000,000.0    
Restricted Stock            
Class of Stock [Line Items]            
Shares granted (in shares)       11,700,000    
Co-Founder Grant | Restricted Stock | Chief Executive Officer            
Class of Stock [Line Items]            
Shares granted (in shares) 10,300,000          
Class A common stock            
Class of Stock [Line Items]            
Votes per share | vote       1    
Common stock, shares authorized (in shares)   2,400,000,000   2,400,000,000    
Common stock, par value (in dollars per share) | $ / shares   $ 0.00001   $ 0.00001    
Common stock, shares issued (in shares)   190,800,000   190,800,000   218,400,000
Common stock, shares outstanding (in shares)   190,800,000   190,800,000   218,400,000
Class A common stock | Co-Founder Grant | Restricted Stock | Chief Executive Officer            
Class of Stock [Line Items]            
Shares granted (in shares)       8,300,000   8,300,000
Class B common stock            
Class of Stock [Line Items]            
Votes per share | vote       10    
Common stock, shares authorized (in shares)   475,000,000.0   475,000,000.0    
Common stock, par value (in dollars per share) | $ / shares   $ 0.00001   $ 0.00001    
Shares converted in conversion (in shares)   300,000 300,000 900,000 1,000,000.0  
Common stock, shares issued (in shares)   76,600,000   76,600,000   77,500,000
Common stock, shares outstanding (in shares)   76,600,000   76,600,000   77,500,000
Class C common stock            
Class of Stock [Line Items]            
Votes per share | vote       0    
Common stock, shares authorized (in shares)   800,000,000.0   800,000,000.0    
Common stock, par value (in dollars per share) | $ / shares   $ 0.00001   $ 0.00001    
Common stock, shares issued (in shares)   0   0   0
Common stock, shares outstanding (in shares)   0   0   0