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Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jul. 24, 2024 USD ($) shares | Jul. 23, 2024 USD ($) | May 16, 2023 shares | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) shares | Sep. 30, 2025 USD ($) reporting_unit | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($)
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Number of reporting units | reporting_unit |  |  |  |  |  |  | 1 |  |
Convertible redeemable preferred stock, net of issuance costs (in shares) | shares | 13,257,294 |  |  |  | 13,257,294 | [1] |  |  |
Accrued dividends | $ 32,800 |  |  | $ 22,900 |  |  | $ 22,900 |  |
Preferred stock, special dividend threshold | 47,000 | $ 100,000 |  |  |  |  | 47,000 |  |
Liquidation preference | $ 32,800 |  |  |  |  |  |  |  |
Impairment of goodwill |  |  |  | 0 | $ 63,000 |  | 0 | $ 63,000 | $ 63,000
Impairment of right-of-use and long-lived assets |  |  |  | $ 0 | $ 1,397 |  | $ 0 | $ 1,397 |
Measurement Input, Discount Rate | Valuation, Income Approach |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
ROU assets and leasehold improvements, measurement input |  |  |  |  | 0.093 |  |  | 0.093 |
Preferred Stock |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Sale of stock (in shares) | shares |  |  | 27,509,203 |  |  |  |  |  |
[1] | Transactions for these line items were exclusively with related parties. Refer to Footnote 5, Convertible Redeemable Preferred Stock and Stockholders' Equity (Deficit) and Footnote 9, Related Party Transactions.

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