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Geographic Information (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended 24 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue $ 0 $ 0 $ 0
Net loss (18,887) (8,445)  
Assets 42,587 36,802 42,587
Long Lived Assets, net 64 106 64
United Kingdom      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue 0 0  
Net loss (17,263) (8,015)  
Assets 6,443 4,480 6,443
Long Lived Assets, net 64 105 64
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net loss (1,624) (430)  
Assets 36,144 32,322 36,144
Long Lived Assets, net $ 0 $ 1 $ 0