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Stockholders’ Deficit - Common stock and preferred stock (Narrative) (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2017
shares
Mar. 31, 2025
vote
$ / shares
shares
Mar. 31, 2024
shares
Dec. 31, 2024
shares
Class of Stock [Line Items]        
Preferred stock, shares authorized (in shares)   240,000,000.0    
Restricted Stock        
Class of Stock [Line Items]        
Shares granted (in shares)   900,000    
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    
Common stock, par value (in dollars per share) | $ / shares   $ 0.00001    
Common stock, shares issued (in shares)   202,600,000   218,400,000
Common stock, shares outstanding (in shares)   202,600,000   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    
Common stock, par value (in dollars per share) | $ / shares   $ 0.00001    
Shares converted in conversion (in shares)   600,000 700,000  
Common stock, shares issued (in shares)   76,800,000   77,500,000
Common stock, shares outstanding (in shares)   76,800,000   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    
Common stock, par value (in dollars per share) | $ / shares   $ 0.00001    
Common stock, shares issued (in shares)   0   0
Common stock, shares outstanding (in shares)   0   0