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Income Taxes - Income tax (benefit) provision related to continuing operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
U.S. Federal provision (benefit)
US Federal Statutory Tax Rate	$ (4,198)	$ (4,433)
State and Local Income Taxes, Net of Federal Income Tax Effect	(532)	(678)
Foreign Tax Effects-Spain
Statutory tax rate difference between Spain and United States	(457)	(231)
Changes in Valuation Allowances	1,332
Changes in Valuation Allowances	2,291	2,901
Nontaxable or Nondeductible Items	(187)	575
Other Adjustments	111	441
Income tax benefit	$ (1,640)	$ (1,425)
Reconciliation of income tax (benefit) rate
US Federal Statutory Tax Rate	21.00%	21.00%
State and Local Income Taxes, Net of Federal Income Tax Effect	2.66%	3.22%
Foreign Tax Effects-Spain
Statutory tax rate difference between Spain and United States	2.29%	1.10%
Changes in Valuation Allowances	(6.66%)	0.00%
Changes in Valuation Allowances	(11.46%)	(13.74%)
Nontaxable or Nondeductible Items	0.93%	(2.72%)
Other Adjustments	(0.56%)	(2.11%)
Effective Tax Rate	8.20%	6.75%

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