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Significant Accounting Policies (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) item | Dec. 31, 2022 USD ($)
Operating segment | item | 1 |
Letters of credit | item | 2 |
Impairment of long-lived assets | $ 0 | $ 0
Impairment of in-process research and development | 0 | 0
Impairment Loss | 0 | 0
Other receivables | 3,363 | 8,531
Long-lived assets | 12,559 | 3,617
UNITED STATES |  |
Long-lived assets | $ 12,400 |
Percentage of long-lived assets | 98.80% |
Grant [Member] |  |
Other receivables | $ 1,500 | $ 1,900

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