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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	$ 2,300
Received amount of Chemomab Therapeutics Inc		$ 351
Expects to receive amount of Chemomab Therapeutics Inc	183
Income tax benefit	$ 0	(534)	$ 0
Israel [Member]
Income Tax Disclosure [Line Items]
Corporate tax rate	23.00%
Capital losses carryforwards	$ 165,000	$ 159,000	$ 143,000
U.S. [Member] | Federal [Member]
Income Tax Disclosure [Line Items]
Corporate tax rate	21.00%

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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