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Taxes (Narrative) (Details) $ in Thousands, £ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 GBP (£)	Dec. 31, 2019 USD ($)
Taxes
Income tax credits - UK research and development	$ 1,299	$ 1,342
US corporate income tax rate	21.00%	35.00%
Valuation allowance for deferred tax assets		$ 35,426		$ 37,370
Reduction in deferred tax assets	$ (4,400)
Increase in valuation allowance	$ 1,900
Federal
Taxes
NOLs carryforward		0		400
Foreign Country - UK
Taxes
NOLs carryforward		$ 191,200		201,700
Annual NOL allowance restriction | £			£ 5.0
Percentage of profits that can be covered by losses brought forward in excess of the annual allowance restriction	50.00%
State
Taxes
NOLs carryforward				$ 19,800
Operating loss carryforward, expiration date	Dec. 31, 2028

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