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Investments in Other Entities and Noncontrolling Interest in a Subsidiary - Investments in Equity Securities (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 31, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Jul. 31, 2025
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Proceeds from equity securities | $ 4,200,000 |  |  |  |  |  |
Gain (loss) on extinguishment of loan receivable classified as available-for-sale securities, |  | $ 313,000 | $ 0 | $ 313,000 | $ 0 |  |
Indemnification holdbacks | 600,000 |  |  |  |  |  |
Convertible promissory notes |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Proceeds from equity securities | 3,700,000 |  |  |  |  |  |
Gain (loss) on equity securities | 1,600,000 |  |  |  |  |  |
Gain (loss) on extinguishment of loan receivable classified as available-for-sale securities, | 300,000 |  |  |  |  |  |
Preferred stock |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Proceeds from equity securities | $ 500,000 |  |  |  |  |  |
Gain (loss) on equity securities |  |  |  |  |  | $ 500,000 |
Other investments |  | $ 1,500,000 |  | 1,500,000 |  |  | $ 1,500,000
Number of shares in other investments |  |  |  |  |  |  | 2,000,000
Equity securities, upward price adjustment |  |  |  | 0 |  |  |
Equity securities, downward price adjustment |  |  |  | 0 |  |  |
Impairment of investments in equity securities |  |  |  | $ 0 |  |  |

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