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Geographic Information (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue		$ 150
Net loss	$ (7,830)	(7,288)
Assets	15,308	19,823
Long Lived Assets, net	27	36
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue		150
Net loss	(7,391)	(7,303)
Assets	3,838	2,439
Long Lived Assets, net	24	33
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net loss	(439)	15
Assets	11,470	17,384
Long Lived Assets, net	$ 3	$ 3

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