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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($)
$ in Thousands
Total
Preferred stock
Class A and Class B Common stock
Additional paid-in capital
Accumulated other comprehensive income (loss)
Retained earnings (accumulated deficit)
Beginning Balance (in shares) at Dec. 31, 2023   247,819,000        
Beginning Balance (in shares) at Dec. 31, 2023     170,998,000      
Beginning Balance at Dec. 31, 2023 $ 1,043,146 $ 332,185 $ 0 $ 170,628 $ 265 $ 540,068
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options and warrants (in shares)     4,822,000      
Exercise of stock options and warrants 1,184     1,184    
Vesting of early exercised stock options 139     139    
Repurchases of common stock (in shares)     (131,000)      
Repurchases of common stock (861)     (3)   (858)
Stock-based compensation 950,143     950,143    
Conversion of preferred stock (in shares)   (1,820,000) 1,820,000      
Conversion of preferred stock 0 $ (2,744)   2,744    
Proceeds from issuance of Class A common stock in connection with initial public offering, net (in shares)     18,064,000      
Proceeds from issuance of Class A common stock in connection with initial public offering, net 418,968   $ 1 418,967    
Issuance of common stock upon release of restricted stock units (in shares)     34,614,000      
Shares withheld for taxes upon release of restricted stock units (in shares)     (18,067,000)      
Shares withheld for taxes upon release of restricted stock units (419,032)     (419,032)    
Other comprehensive income 4,642       4,642  
Net loss (829,927)         (829,927)
Ending Balance (in shares) at Sep. 30, 2024   245,999,000        
Ending Balance (in shares) at Sep. 30, 2024     212,120,000      
Ending Balance at Sep. 30, 2024 1,168,402 $ 329,441 $ 1 1,124,770 4,907 (290,717)
Beginning Balance (in shares) at Jun. 30, 2024   247,819,000        
Beginning Balance (in shares) at Jun. 30, 2024     206,005,000      
Beginning Balance at Jun. 30, 2024 862,429 $ 332,185 $ 1 806,018 (656) (275,119)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options and warrants (in shares)     4,386,000      
Exercise of stock options and warrants 1,059     1,059    
Repurchases of common stock (in shares)     (91,000)      
Stock-based compensation 89,458     89,458    
Conversion of preferred stock (in shares)   (1,820,000) 1,820,000      
Conversion of preferred stock 0 $ (2,744)   2,744    
Reclassification of share-based liability awards 225,491     225,491    
Other comprehensive income 5,563       5,563  
Net loss (15,598)         (15,598)
Ending Balance (in shares) at Sep. 30, 2024   245,999,000        
Ending Balance (in shares) at Sep. 30, 2024     212,120,000      
Ending Balance at Sep. 30, 2024 1,168,402 $ 329,441 $ 1 1,124,770 4,907 (290,717)
Beginning Balance (in shares) at Dec. 31, 2024   245,999,000        
Beginning Balance (in shares) at Dec. 31, 2024     214,906,000      
Beginning Balance at Dec. 31, 2024 1,324,053 $ 329,441 $ 1 1,186,207 1,314 (192,910)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options and warrants (in shares)     2,995,000      
Exercise of stock options and warrants 47,586     47,586    
Stock-based compensation 1,147,325     1,147,325    
Other (12)     (12)    
Conversion of preferred stock (in shares)   (245,999,000) 245,999,000      
Conversion of preferred stock $ 0 $ (329,441) $ 3 $ 329,438    
Proceeds from issuance of Class A common stock in connection with initial public offering, net (in shares) 385,405,000   12,473,000 385,405,000    
Issuance of common stock upon release of restricted stock units (in shares)     28,793,000      
Shares withheld for taxes upon release of restricted stock units (in shares)     (13,207,000)      
Shares withheld for taxes upon release of restricted stock units $ (494,649)     $ (494,649)    
Other comprehensive income 2,118       2,118  
Stock issued in connection with business combination (in shares)     700,000      
Stock issued in connection with business combination 600     600    
Net loss $ (1,023,906)         (1,023,906)
Ending Balance (in shares) at Sep. 30, 2025 0 0        
Ending Balance (in shares) at Sep. 30, 2025     492,659,000      
Ending Balance at Sep. 30, 2025 $ 1,388,520 $ 0 $ 4 2,601,900 3,432 (1,216,816)
Beginning Balance (in shares) at Jun. 30, 2025   245,999,000        
Beginning Balance (in shares) at Jun. 30, 2025     216,653,000      
Beginning Balance at Jun. 30, 2025 1,427,214 $ 329,441 $ 1 1,215,071 2,502 (119,801)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options and warrants (in shares)     1,948,000      
Exercise of stock options and warrants 26,936     26,936    
Stock-based compensation 1,139,699     1,139,699    
Conversion of preferred stock (in shares)   (245,999,000) 245,999,000      
Conversion of preferred stock 0 $ (329,441) $ 3 329,438    
Proceeds from issuance of Class A common stock in connection with initial public offering, net (in shares)     12,473,000      
Proceeds from issuance of Class A common stock in connection with initial public offering, net 385,405     385,405    
Issuance of common stock upon release of restricted stock units (in shares)     28,793,000      
Shares withheld for taxes upon release of restricted stock units (in shares)     (13,207,000)      
Shares withheld for taxes upon release of restricted stock units (494,649)     (494,649)    
Other comprehensive income 930       930  
Net loss $ (1,097,015)         (1,097,015)
Ending Balance (in shares) at Sep. 30, 2025 0 0        
Ending Balance (in shares) at Sep. 30, 2025     492,659,000      
Ending Balance at Sep. 30, 2025 $ 1,388,520 $ 0 $ 4 $ 2,601,900 $ 3,432 $ (1,216,816)