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Stock-Based Compensation And Stock Repurchases (Summary Of Stock Options Outstanding And Exercisable) (Details) - $ / shares | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Stock Options, Granted | 0 | 0 |
Class A [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Stock Options, Beginning balance | 412,779 | 327,498 |
Number of Stock Options, Granted | 1,264,603 | 207,657 |
Number of Stock Options, Forfeited | (205,122) | (122,376) |
Number of Stock Options Outstanding, Ending balance | 1,472,260 | 412,779 | 327,498
Weighted Average Exercise Price of Options Outstanding, Beginning price | $ 14.19 | $ 15.87 |
Weighted Average Exercise Price of Options Outstanding, Granted | 1.47 | 1.92 |
Weighted Average Exercise Price of Options Outstanding, Ending price | $ 1.66 | $ 14.19 | $ 15.87
Weighted Average Remaining Years of Contractual Life | 9 years 7 months 9 days | 1 year 9 months 14 days | 1 year 2 months 26 days

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