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Stockholders' Equity and Redeemable Convertible Preferred Stock (Details) - Redeemable Convertible Preferred Stock
$ / shares in Units, $ in Thousands
Mar. 31, 2025
USD ($)
$ / shares
shares
Class of Stock [Line Items]  
Temporary equity, shares authorized (in shares) 65,408,000
Temporary equity, Shares outstanding 48,446,000
Temporary equity, Carrying value | $ $ 887,074
Series Seed Preferred Stock  
Class of Stock [Line Items]  
Temporary equity, par or stated value per share | $ / shares $ 0.0001
Temporary equity, shares authorized (in shares) 2,023,000
Temporary equity, Shares outstanding 2,023,000
Temporary equity, Carrying value | $ $ 2,950
Series Seed-1 Preferred Stock  
Class of Stock [Line Items]  
Temporary equity, par or stated value per share | $ / shares $ 0.0001
Temporary equity, shares authorized (in shares) 3,273,000
Temporary equity, Shares outstanding 3,273,000
Temporary equity, Carrying value | $ $ 204,454
Series A Preferred Stock  
Class of Stock [Line Items]  
Temporary equity, par or stated value per share | $ / shares $ 0.0001
Temporary equity, shares authorized (in shares) 6,005,000
Temporary equity, Shares outstanding 6,005,000
Temporary equity, Carrying value | $ $ 74,913
Series B Preferred Stock  
Class of Stock [Line Items]  
Temporary equity, par or stated value per share | $ / shares $ 0.0001
Temporary equity, shares authorized (in shares) 5,869,000
Temporary equity, Shares outstanding 5,869,000
Temporary equity, Carrying value | $ $ 72,096
Series C Preferred Stock  
Class of Stock [Line Items]  
Temporary equity, par or stated value per share | $ / shares $ 0.0001
Temporary equity, shares authorized (in shares) 11,159,000
Temporary equity, Shares outstanding 11,159
Temporary equity, Carrying value | $ $ 219,450
Series M Preferred Stock  
Class of Stock [Line Items]  
Temporary equity, par or stated value per share | $ / shares $ 0.0001
Temporary equity, shares authorized (in shares) 2,812,000
Temporary equity, Shares outstanding 2,812,000
Temporary equity, Carrying value | $ $ 10,990
Series J Preferred Stock  
Class of Stock [Line Items]  
Temporary equity, par or stated value per share | $ / shares $ 0.0001
Temporary equity, shares authorized (in shares) 922,000
Temporary equity, Shares outstanding 0
Temporary equity, Carrying value | $ $ 0
Series D-1 Preferred Stock  
Class of Stock [Line Items]  
Temporary equity, par or stated value per share | $ / shares $ 0.0001
Temporary equity, shares authorized (in shares) 26,594,000
Temporary equity, Shares outstanding 17,305,000
Temporary equity, Carrying value | $ $ 302,221
Series D-2 Preferred Stock  
Class of Stock [Line Items]  
Temporary equity, par or stated value per share | $ / shares $ 0.0001
Temporary equity, shares authorized (in shares) 1,241,000
Temporary equity, Shares outstanding 0
Temporary equity, Carrying value | $ $ 0
Series D-3 Preferred Stock  
Class of Stock [Line Items]  
Temporary equity, par or stated value per share | $ / shares $ 0.0001
Temporary equity, shares authorized (in shares) 5,510,000
Temporary equity, Shares outstanding 0
Temporary equity, Carrying value | $ $ 0