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Warrants, Redeemable Convertible Preferred Stock and Stockholders' Equity - Schedule of Redeemable Convertible Preferred Stock (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Temporary Equity [Line Items] |  |  |  |
Beginning balance |  |  | $ 378,150 |
Ending balance | $ 0 |  | 0 |
Series Seed Redeemable Convertible Preferred Stock [Member] |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Beginning balance | $ 2,473 | $ 2,473 | $ 2,473 | $ 2,473
Beginning balance (in shares) | 5,045,368 | 5,045,368 | 5,045,368 | 5,045,368
Issuance of Series G preferred stock, net |  | $ 0 |  | $ 0
Issuance of Series G preferred stock, net (in shares) |  | 0 |  | 0
Conversion of preferred stock to common stock upon IPO | $ (2,473) |  | $ (2,473) |
Conversion of preferred stock to common stock upon IPO (in shares) | (5,045,368) |  | (5,045,368) |
Ending balance | $ 0 | $ 2,473 | $ 0 | $ 2,473
Ending balance (in shares) | 0 | 5,045,368 | 0 | 5,045,368
Series A Redeemable Convertible Preferred Stock [Member] |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Beginning balance | $ 5,179 | $ 5,179 | $ 5,179 | $ 5,179
Beginning balance (in shares) | 8,255,614 | 8,255,614 | 8,255,614 | 8,255,614
Issuance of Series G preferred stock, net |  | $ 0 |  | $ 0
Issuance of Series G preferred stock, net (in shares) |  | 0 |  | 0
Conversion of preferred stock to common stock upon IPO | $ (5,179) |  | $ (5,179) |
Conversion of preferred stock to common stock upon IPO (in shares) | (8,255,614) |  | (8,255,614) |
Ending balance | $ 0 | $ 5,179 | $ 0 | $ 5,179
Ending balance (in shares) | 0 | 8,255,614 | 0 | 8,255,614
Series B Redeemable Convertible Preferred Stock [Member] |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Beginning balance | $ 10,827 | $ 10,827 | $ 10,827 | $ 10,827
Beginning balance (in shares) | 18,894,315 | 18,894,315 | 18,894,315 | 18,894,315
Issuance of Series G preferred stock, net |  | $ 0 |  | $ 0
Issuance of Series G preferred stock, net (in shares) |  | 0 |  | 0
Conversion of preferred stock to common stock upon IPO | $ (10,827) |  | $ (10,827) |
Conversion of preferred stock to common stock upon IPO (in shares) | (18,894,315) |  | (18,894,315) |
Ending balance | $ 0 | $ 10,827 | $ 0 | $ 10,827
Ending balance (in shares) | 0 | 18,894,315 | 0 | 18,894,315
Series C Redeemable Convertible Preferred Stock [Member] |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Beginning balance | $ 24,908 | $ 24,908 | $ 24,908 | $ 24,908
Beginning balance (in shares) | 42,890,840 | 42,890,840 | 42,890,840 | 42,890,840
Issuance of Series G preferred stock, net |  | $ 0 |  | $ 0
Issuance of Series G preferred stock, net (in shares) |  | 0 |  | 0
Conversion of preferred stock to common stock upon IPO | $ (24,908) |  | $ (24,908) |
Conversion of preferred stock to common stock upon IPO (in shares) | (42,890,840) |  | (42,890,840) |
Ending balance | $ 0 | $ 24,908 | $ 0 | $ 24,908
Ending balance (in shares) | 0 | 42,890,840 | 0 | 42,890,840
Series D Redeemable Convertible Preferred Stock [Member] |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Beginning balance | $ 33,411 | $ 33,411 | $ 33,411 | $ 33,411
Beginning balance (in shares) | 39,656,811 | 39,656,811 | 39,656,811 | 39,656,811
Issuance of Series G preferred stock, net |  | $ 0 |  | $ 0
Issuance of Series G preferred stock, net (in shares) |  | 0 |  | 0
Conversion of preferred stock to common stock upon IPO | $ (33,411) |  | $ (33,411) |
Conversion of preferred stock to common stock upon IPO (in shares) | (39,656,811) |  | (39,656,811) |
Ending balance | $ 0 | $ 33,411 | $ 0 | $ 33,411
Ending balance (in shares) | 0 | 39,656,811 | 0 | 39,656,811
Series E Redeemable Convertible Preferred Stock [Member] |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Beginning balance | $ 29,738 | $ 29,738 | $ 29,738 | $ 29,738
Beginning balance (in shares) | 29,019,153 | 29,019,153 | 29,019,153 | 29,019,153
Issuance of Series G preferred stock, net |  | $ 0 |  | $ 0
Issuance of Series G preferred stock, net (in shares) |  | 0 |  | 0
Conversion of preferred stock to common stock upon IPO | $ (29,738) |  | $ (29,738) |
Conversion of preferred stock to common stock upon IPO (in shares) | (29,019,153) |  | (29,019,153) |
Ending balance | $ 0 | $ 29,738 | $ 0 | $ 29,738
Ending balance (in shares) | 0 | 29,019,153 | 0 | 29,019,153
Series F Redeemable Convertible Preferred Stock [Member] |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Beginning balance | $ 132,975 | $ 132,975 | $ 132,975 | $ 132,975
Beginning balance (in shares) | 74,840,147 | 74,840,147 | 74,840,147 | 74,840,147
Issuance of Series G preferred stock, net |  | $ 0 |  | $ 0
Issuance of Series G preferred stock, net (in shares) |  | 0 |  | 0
Conversion of preferred stock to common stock upon IPO | $ (132,975) |  | $ (132,975) |
Conversion of preferred stock to common stock upon IPO (in shares) | (74,840,147) |  | (74,840,147) |
Ending balance | $ 0 | $ 132,975 | $ 0 | $ 132,975
Ending balance (in shares) | 0 | 74,840,147 | 0 | 74,840,147
Series F-1 Redeemable Convertible Preferred Stock [Member] |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Beginning balance | $ 49,392 | $ 49,392 | $ 49,392 | $ 49,392
Beginning balance (in shares) | 23,664,027 | 23,664,027 | 23,664,027 | 23,664,027
Issuance of Series G preferred stock, net |  | $ 0 |  | $ 0
Issuance of Series G preferred stock, net (in shares) |  | 0 |  | 0
Conversion of preferred stock to common stock upon IPO | $ (49,392) |  | $ (49,392) |
Conversion of preferred stock to common stock upon IPO (in shares) | (23,664,027) |  | (23,664,027) |
Ending balance | $ 0 | $ 49,392 | $ 0 | $ 49,392
Ending balance (in shares) | 0 | 23,664,027 | 0 | 23,664,027
Series G Redeemable Convertible Preferred Stock [Member] |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Beginning balance | $ 89,247 | $ 82,754 | $ 89,247 | $ 31,258
Beginning balance (in shares) | 99,229,883 | 92,041,042 | 99,229,883 | 34,972,704
Issuance of Series G preferred stock, net |  | $ 6,487 |  | $ 57,983
Issuance of Series G preferred stock, net (in shares) |  | 7,188,841 |  | 64,257,179
Conversion of preferred stock to common stock upon IPO | $ (89,247) |  | $ (89,247) |
Conversion of preferred stock to common stock upon IPO (in shares) | (99,229,883) |  | (99,229,883) |
Ending balance | $ 0 | $ 89,241 | $ 0 | $ 89,241
Ending balance (in shares) | 0 | 99,229,883 | 0 | 99,229,883

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