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Geographic Information (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenue
Net loss (8,445) (7,830)
Assets 36,802 15,308
Long Lived Assets, net 106 27
United Kingdom    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net loss (8,015) (7,391)
Assets 4,480 3,838
Long Lived Assets, net 105 24
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net loss (430) (439)
Assets 32,322 11,470
Long Lived Assets, net $ 1 $ 3