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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Line Items] |  |  |
Net change in the total valuation allowance |  | $ 5,200 |
Received amount of Chemomab Therapeutics Inc |  | 351 |
Income tax benefit |  | $ (534) | $ 0
Israel [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Corporate tax rate |  | 23.00% |
Capital losses carryforwards |  | $ 159,000 | $ 143,000
U.S. [Member] | Federal [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Corporate tax rate |  | 21.00% |
Forecast [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Expects to receive amount of Chemomab Therapeutics Inc | $ 183 |  |

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