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Stock-Based Compensation and Stock Repurchases (Summary Of Stock Options Outstanding And Exercisable) (Details) - Class A [Member] - $ / shares | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Stock Options, Beginning balance | 1,707,412 | 412,779 |
Number of Stock Options, Granted | 2,087,885 | 1,499,755 |
Number of Stock Options, Forfeited |  | (205,122) |
Number of Stock Options Outstanding, Ending balance | 3,795,297 | 1,707,412 | 412,779
Weighted Average Exercise Price of Options Outstanding, Beginning price | $ 1.63 | $ 14.19 |
Weighted Average Exercise Price of Options Outstanding, Granted | 1.42 | 1.49 |
Weighted Average Exercise Price of Options Outstanding, Ending price | $ 1.50 | $ 1.63 | $ 14.19
Weighted Average Remaining Years of Contractual Life | 6 years 6 months | 9 years 5 months 8 days | 1 year 9 months 14 days

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- Definition Line items represent financial concepts included in a table. 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