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Redeemable Convertible Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Redeemable Convertible Preferred Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage Of Dividend Original Issue Price |  |  |  |  |  | 8.00% |  |  |  |  |  |
Dividends Payable |  |  |  |  |  | $ 0 |  |  |  |  |  |
Preferred Stock, Shares Outstanding |  |  |  |  |  | 93,963,000 |  |  |  |  | 93,963,000 |
Common Stock, Shares, Outstanding | 174,957,000 | 174,957,000 | 6,250,000,000 | 174,957,000 | 6,250,000,000 | 58,057,000 |  |  |  |  | 87,222,000 |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  |  |  | $ 500,000 |  |  |  |  |  |
Preferred stock, issued (in shares) |  |  |  |  |  | 93,963,000 |  |  |  |  | 93,963,000 |
Fair value of preferred stock | $ 315,600 |  |  |  |  |  |  |  |  |  |  |
Recognised loss on issuance of cumulative redeemable convertible preferred stock | 84,200 |  |  |  |  |  |  |  |  |  |  |
Total recognised loss on issuance of cumulative redeemable convertible preferred stock | 170,600 |  |  |  |  |  |  |  |  |  |  |
Loss on issuance of common stock warrants | $ 86,400 | $ 123,328 | $ 0 | $ 123,328 | $ 0 |  |  |  |  |  |  |
Changes in redemption value of preference stock |  | $ 0 |  | $ 0 |  |  |  |  |  |  |  |
Percentage of redemption price preference stock | 150.00% |  |  |  |  |  |  |  |  |  |  |
Percentage of redemption price preference stock decrease | 140.00% |  |  |  |  |  |  |  |  |  |  |
Percentage of redemption price preference stock second to third anniversary | 130.00% |  |  |  |  |  |  |  |  |  |  |
Percentage of redemption price preference stock third to fourth anniversary | 120.00% |  |  |  |  |  |  |  |  |  |  |
Percentage of redemption price preference stock fourth to fifth anniversary | 110.00% |  |  |  |  |  |  |  |  |  |  |
Percentage of redemption price preference stock fifth anniversary | 100.00% |  |  |  |  |  |  |  |  |  |  |
Common stock of convertible conversion share | 62,240,390 |  |  |  |  |  |  |  |  |  |  |
PIPE Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Convertible Preferred Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, number of securities called by warrants or rights | 17,769,375 | 17,769,375 |  | 17,769,375 |  |  |  |  |  |  |  |
Proceeds from issuance of warrants | $ 145,000 |  |  |  |  |  |  |  |  |  |  |
Fair value adjustment of warrants | $ 86,400 |  |  |  |  |  |  |  |  |  |  |
IPO [Member] |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Convertible Preferred Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  |  |  | $ 100,000 |  |  |  |  |  |
Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Convertible Preferred Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  |  |  | $ 100,000 |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Convertible Preferred Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares, Outstanding | 174,957,000 | 174,957,000 | 57,855,000 | 174,957,000 | 57,855,000 | 58,057,000 | 59,742,000 | 59,016,000 | 57,812,000 | 57,797,000 | 57,776,000 | 86,360,000
Board of Directors Chairman [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Convertible Preferred Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares, Outstanding |  |  |  |  |  | 7,500,000 |  |  |  |  |  |
Series A Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Convertible Preferred Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price |  |  |  |  |  | $ 1.482355 |  |  |  |  |  |
Series A Redeemable Convertible Preferred Stock [Member] | Board of Directors Chairman [Member] |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Convertible Preferred Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding |  |  |  |  |  | 5,059,290 |  |  |  |  |  |
Series B1 And B2 Redeemable Convertible Preferred Stock [Member] | Board of Directors Chairman [Member] |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Convertible Preferred Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding |  |  |  |  |  | 853,224 |  |  |  |  |  |
Series Seed Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Convertible Preferred Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price |  |  |  |  |  | $ 0.444706 |  |  |  |  |  |
Series B1 Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Convertible Preferred Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price |  |  |  |  |  | 1.59349 |  |  |  |  |  |
Series B2 Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Convertible Preferred Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price |  |  |  |  |  | $ 2.34405 |  |  |  |  |  |
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Convertible Preferred Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding | 142,000 | 142,000 |  | 142,000 |  | 0 |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price | $ 12 | $ 12 |  | $ 12 |  |  |  |  |  |  |  |
Preferred stock, issued (in shares) | 142,000 | 142,000 |  | 142,000 |  | 0 |  |  |  |  |  |
Preferred stock, dividend rate, percentage | 9.99% |  |  |  |  |  |  |  |  |  |  |
Preferred stock discount rate percentage | 25.00% |  |  |  |  |  |  |  |  |  |  |
Preferred stock volatility assumption rate percentage | 55.00% |  |  |  |  |  |  |  |  |  |  |
Fair value of preferred stock | $ 229,200 |  |  |  |  |  |  |  |  |  |  |
Percentage of dividend paid in cash | 7.99% |  |  |  |  |  |  |  |  |  |  |
Series A Preferred Stock [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Convertible Preferred Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price | $ 8 | $ 8 |  | $ 8 |  |  |  |  |  |  |  |
Preferred stock, redemption amount | $ 223,200 | $ 223,200 |  | $ 223,200 |  |  |  |  |  |  |  |
Series A Preferred Stock [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Convertible Preferred Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price | $ 6 | $ 6 |  | $ 6 |  |  |  |  |  |  |  |
Preferred stock, redemption amount | $ 170,900 | $ 170,900 |  | $ 170,900 |  |  |  |  |  |  |  |
Series A Preferred Stock [Member] | Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Convertible Preferred Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, issued (in shares) | 142,155 | 142,155 |  | 142,155 |  |  |  |  |  |  |  |
Redeemable Preferred Stock [Member] | Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Convertible Preferred Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding | 0 | 0 |  | 0 |  |  |  |  |  |  |  |
Preferred stock, issued (in shares) | 0 | 0 |  | 0 |  |  |  |  |  |  |  |

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