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Redeemable Convertible Preferred Stock - Schedule Of Redeemable Convertible Preferred Stock (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Redeemable Convertible Preferred Stock [Line Items] |  |  |
Shares Issued and Outstanding | 62,240 |  |
Carrying Value | $ 170,648 | $ 170,648 | $ 170,648
Liquidation Preference | $ 170,089 |  |
Series Seed Redeemable Convertible Preferred Stock [Member] |  |  |
Redeemable Convertible Preferred Stock [Line Items] |  |  |
Shares Authorized |  | 6,746 |
Shares Issued and Outstanding | 4,468 | 6,746 |
Carrying Value | $ 3,000 | $ 3,000 |
Liquidation Preference | $ 3,000 | $ 3,000 |
Series A Redeemable Convertible Preferred Stock [Member] |  |  |
Redeemable Convertible Preferred Stock [Line Items] |  |  |
Shares Authorized |  | 27,470 |
Shares Issued and Outstanding | 16,851 | 25,439 |
Carrying Value | $ 37,537 | $ 37,537 |
Liquidation Preference | $ 37,710 | $ 37,710 |
Series B1 Redeemable Convertible Preferred Stock [Member] |  |  |
Redeemable Convertible Preferred Stock [Line Items] |  |  |
Shares Authorized |  | 20,559 |
Shares Issued and Outstanding | 13,618 | 20,559 |
Carrying Value | $ 37,716 | $ 37,716 |
Liquidation Preference | $ 32,760 | $ 32,760 |
Series B2 Redeemable Convertible Preferred Stock [Member] |  |  |
Redeemable Convertible Preferred Stock [Line Items] |  |  |
Shares Authorized |  | 43,352 |
Shares Issued and Outstanding | 27,303 | 41,219 |
Carrying Value | $ 92,395 | $ 92,395 |
Liquidation Preference | 96,619 | $ 96,619 |
Redeemable Convertible Preferred Stock [Member] |  |  |
Redeemable Convertible Preferred Stock [Line Items] |  |  |
Shares Authorized |  | 98,127 |
Shares Issued and Outstanding |  | 93,963 |
Carrying Value | $ 0 | $ 170,648 |
Liquidation Preference |  | $ 170,089 |

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