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Redeemable Convertible Preferred Stock, Redeemable Common Stock, and Stockholders’ Equity (Deficit) - Common Stock (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2025
voting_right
$ / shares
shares
Dec. 31, 2024
voting_right
$ / shares
shares
Class of Stock [Line Items]    
Common shares, shares authorized (in shares) 3,400,000,000 690,680,000
Common shares, par value (usd per share) | $ / shares $ 0.000005 $ 0.000005
Common stock dividends declared (usd per share) | $ / shares $ 0 $ 0
Common Class C    
Class of Stock [Line Items]    
Common shares, shares authorized (in shares) 200,000,000 0
Common shares, par value (usd per share) | $ / shares $ 0.000005 $ 0.000005
Common shares, shares outstanding (in shares) 0 0
Common shares, shares issued (in shares) 0 0
Voting rights for common stock | voting_right 0  
Common Class A    
Class of Stock [Line Items]    
Common shares, shares authorized (in shares) 3,000,000,000 540,680,000
Common shares, par value (usd per share) | $ / shares $ 0.000005 $ 0.000005
Common shares, shares outstanding (in shares) 384,857,000 114,689,000
Common shares, shares issued (in shares) 391,445,000 121,277,000
Voting rights for common stock | voting_right 1  
Common Class B    
Class of Stock [Line Items]    
Common shares, shares authorized (in shares) 200,000,000 150,000,000
Common shares, par value (usd per share) | $ / shares $ 0.000005 $ 0.000005
Common shares, shares outstanding (in shares) 112,733,000 118,198,000
Common shares, shares issued (in shares) 112,733,000 118,198,000
Voting rights for common stock | voting_right 10 1