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Taxes (Narrative) (Details) $ in Thousands, £ in Millions			12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 30, 2019	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 GBP (£)	Dec. 31, 2020 USD ($)
Taxes
Income tax credits - UK research and development			$ 1,238	$ 1,299
Income tax benefit			(1,236)	(1,296)
Valuation allowance for deferred tax assets	$ 37,370			37,370		$ 42,063
Increase in valuation allowance			$ 4,700
Federal
Taxes
NOLs carryforward	400			400		1,100
State
Taxes
NOLs carryforward	19,800			19,800		20,500
Operating loss carryforward, expiration date			Dec. 31, 2028
Foreign Country - UK
Taxes
NOLs carryforward	$ 201,700			$ 201,700		$ 212,400
Percentage of tax rate adopted in respect of deferred tax assets measurement			50.00%
UK corporate income tax rate	17.00%	19.00%	19.00%
Increase in deferred tax assets			$ 3,900
Annual NOL allowance restriction | £					£ 5
Increase in valuation allowance			$ 3,900

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