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Cash and Cash Equivalents (Summary of Cash and Cash Equivalents) (Details) - USD ($) $ in Thousands | Mar. 11, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Cash and Cash Equivalents |  |  |
Cash | $ 3,400 | $ 3,303 | $ 13,798
Cash equivalents |  | 75 | 4,547
Total cash and cash equivalents |  | $ 3,378 | $ 18,345

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