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Stockholders Deficit and Redeemable Convertible Preferred Stock - Schedule of Redeemable Convertible Preferred Stock (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Redeemable convertible preferred stock    
Class of Stock [Line Items]    
Temporary equity, shares authorized (in shares)   51,033
Temporary equity, Shares issued   41,588
Temporary equity, Shares outstanding   41,588
Temporary equity, Carrying value   $ 759,582
Series Seed Preferred Stock | Redeemable convertible preferred stock    
Class of Stock [Line Items]    
Temporary equity, par or stated value per share   $ 0.0001
Temporary equity, shares authorized (in shares)   2,023
Temporary equity, Shares issued   2,023
Temporary equity, Shares outstanding   2,023
Temporary equity, Carrying value   $ 2,950
Series Seed-1 Preferred Stock | Redeemable convertible preferred stock    
Class of Stock [Line Items]    
Temporary equity, par or stated value per share   $ 0.0001
Temporary equity, shares authorized (in shares)   3,273
Temporary equity, Shares issued   3,273
Temporary equity, Shares outstanding   3,273
Temporary equity, Carrying value   $ 204,454
Series A Preferred Stock | Redeemable convertible preferred stock    
Class of Stock [Line Items]    
Temporary equity, par or stated value per share   $ 0.0001
Temporary equity, shares authorized (in shares)   6,005
Temporary equity, Shares issued   6,005
Temporary equity, Shares outstanding   6,005
Temporary equity, Carrying value   $ 74,913
Series B Preferred Stock | Redeemable convertible preferred stock    
Class of Stock [Line Items]    
Temporary equity, par or stated value per share   $ 0.0001
Temporary equity, shares authorized (in shares)   5,869
Temporary equity, Shares issued   5,869
Temporary equity, Shares outstanding   5,869
Temporary equity, Carrying value   $ 72,096
Series C Preferred Stock | Redeemable convertible preferred stock    
Class of Stock [Line Items]    
Temporary equity, par or stated value per share   $ 0.0001
Temporary equity, shares authorized (in shares)   11,159
Temporary equity, Shares issued   11,159
Temporary equity, Shares outstanding   11,159
Temporary equity, Carrying value   $ 213,871
Series M Preferred Stock | Redeemable convertible preferred stock    
Class of Stock [Line Items]    
Temporary equity, par or stated value per share   $ 0.0001
Temporary equity, shares authorized (in shares)   2,812
Temporary equity, Shares issued   2,812
Temporary equity, Shares outstanding   2,812
Temporary equity, Carrying value   $ 10,990
Series J Preferred Stock | Redeemable convertible preferred stock    
Class of Stock [Line Items]    
Temporary equity, par or stated value per share   $ 0.0001
Temporary equity, shares authorized (in shares)   922
Temporary equity, Shares issued   0
Temporary equity, Shares outstanding   0
Temporary equity, Carrying value   $ 0
Series D-1 Preferred Stock | Redeemable convertible preferred stock    
Class of Stock [Line Items]    
Temporary equity, par or stated value per share   $ 0.0001
Temporary equity, shares authorized (in shares)   17,729
Temporary equity, Shares issued   10,447
Temporary equity, Shares outstanding   10,447
Temporary equity, Carrying value   $ 180,308
Series D-2 Preferred Stock | Redeemable convertible preferred stock    
Class of Stock [Line Items]    
Temporary equity, par or stated value per share   $ 0.0001
Temporary equity, shares authorized (in shares)   1,241
Temporary equity, Shares issued   0
Temporary equity, Shares outstanding   0
Temporary equity, Carrying value   $ 0
Redeemable Convertible Preferred Stock    
Class of Stock [Line Items]    
Temporary equity, par or stated value per share $ 0.0001 $ 0.0001
Temporary equity, shares authorized (in shares) 100,000 51,033
Temporary equity, Shares issued 0 41,588
Temporary equity, Shares outstanding 0 41,588