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Cash Equivalents (Schedule of Cash Equivalents) (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Cash And Cash Equivalents [Line Items] |  |  |  |
Cash equivalents | $ 3,458 | $ 40,437 | $ 44,784 | $ 76,110
Cost [Member] |  |  |  |
Cash And Cash Equivalents [Line Items] |  |  |  |
Cash equivalents | 413 | 6,954 |  |
Cost [Member] | Institutional Money Market Funds [Member] |  |  |  |
Cash And Cash Equivalents [Line Items] |  |  |  |
Cash equivalents | 413 | 6,954 |  |
Estimated Fair Value [Member] |  |  |  |
Cash And Cash Equivalents [Line Items] |  |  |  |
Cash equivalents | 413 | 6,954 |  |
Estimated Fair Value [Member] | Institutional Money Market Funds [Member] |  |  |  |
Cash And Cash Equivalents [Line Items] |  |  |  |
Cash equivalents | $ 413 | $ 6,954 |  |

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