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Related Party Loans and Convertible Notes - Convertible Notes (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions |  |  |  |  | 1 Months Ended | 2 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 11, 2025 | May 15, 2025 | Sep. 30, 2024 | Nov. 30, 2023 | Mar. 31, 2024 | Dec. 31, 2023 | Oct. 31, 2023 | Sep. 30, 2023 | Feb. 29, 2024 | Feb. 29, 2024 | Oct. 31, 2023 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Mar. 01, 2024 | Dec. 27, 2023 | Nov. 22, 2023 | Sep. 15, 2023
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from related party convertible notes |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 24,568 |  |  |  |  |
Conversion of related party loans and related party convertible notes to common stock in connection with initial public offering |  |  |  |  |  |  |  |  |  |  |  | 804,297 | $ 0 |  |  |  |  |
Class A common stock | IPO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price per share (in dollars per share) | $ 28.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 228,000 |  |  |  |  |  |  |  |  |  |  | 200,000 |  | $ 200,000 |  |  |  |
Proceeds from related party convertible notes |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 69,897 |  |  |  |
Stated interest rate |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum amount of aggregate gross proceeds from issuance of convertible preferred units that trigger a qualified financing event |  | $ 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Qualified financing event, conversion price as a percentage of the lowest price per unit paid by the other purchasers of the convertible preferred units |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-qualified financing event, maximum amount of proceeds received to trigger the option to convert the outstanding notes |  | $ 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-qualified financing event, conversion price as a percentage of lowest price paid per unit by the purchasers of the convertible preferred units |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note holder option, price of conversion as a percentage of the lowest original issue price |  | 80.00% | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in control, conversion price as a percentage of the lowest price per unit offered in the change of control event |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public company event, conversion price as a percentage of the price per common unit implied in the public company event |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of related party loans and related party convertible notes to common stock in connection with initial public offering | $ 285,000 |  |  |  |  |  |  |  |  |  |  | 285,007 |  |  |  |  |  |
Convertible Notes | Class B common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares resulting from conversion of debt (in shares) | 10.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price per share resulting from converted debt (in dollars per share) | $ 22.40 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of IPO price, resulting from converted debt | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
September Note (USD) | Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000
Proceeds from related party convertible notes |  |  |  |  |  |  | $ 21,500 | $ 28,500 |  |  | $ 50,000 | 0 |  | 0 |  |  |  |
Conversion of related party loans and related party convertible notes to common stock in connection with initial public offering |  |  |  |  |  |  |  |  |  |  |  | 72,279 |  |  |  |  |  |
November Note (BTC) | Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 54,671 |
Proceeds from related party convertible notes |  |  |  | $ 54,700 |  |  |  |  |  |  |  | 0 |  | 0 |  |  |  |
Conversion of related party loans and related party convertible notes to common stock in connection with initial public offering |  |  |  |  |  |  |  |  |  |  |  | 78,269 |  |  |  |  |  |
December Note (USD) | Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000 |  |
Proceeds from related party convertible notes |  |  |  |  |  | $ 25,400 |  |  | $ 24,600 | $ 50,000 |  | 0 |  | 24,568 |  |  |  |
Conversion of related party loans and related party convertible notes to common stock in connection with initial public offering |  |  |  |  |  |  |  |  |  |  |  | 70,804 |  |  |  |  |  |
March Note (BTC) | Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 45,329 |  |  |
Proceeds from related party convertible notes |  |  |  |  | $ 45,300 |  |  |  |  |  |  | 0 |  | $ 45,329 |  |  |  |
Conversion of related party loans and related party convertible notes to common stock in connection with initial public offering |  |  |  |  |  |  |  |  |  |  |  | $ 63,655 |  |  |  |  |  |

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