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Taxes (Reconciliation of (Benefit) Provision for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Reconciliation of the (benefit) provision for income taxes
Loss from continuing operations before taxes	$ (25,551)	$ (25,915)
Income tax expense computed at statutory federal tax rate	(5,366)	(5,442)
Disallowed expenses and non-taxable income	782	369
Loss surrendered to generate R&D credit	4,865	6,169
Additional research and development tax relief	(5,409)	(4,719)
Stock Compensation	62	105
Change in valuation allowance	1,261	2,310
Foreign items, including change in tax rates, and other		(20)
Change in UK Tax Rate		(2)
Other foreign items	809	(3,487)
Current - total	$ (2,996)	$ (4,717)

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