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Geographic Information (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Sep. 30, 2021
Jun. 30, 2022
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2022
Dec. 31, 2021
Mar. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]                  
Revenue             $ 0 $ 0  
Net loss $ (5,096) $ (4,575) $ (4,757) $ (8,683) $ (13,779) $ (13,363) (21,198) (18,457)  
Assets $ 31,570 $ 35,895 $ 45,293 $ 35,895 $ 31,570 $ 45,293 28,050 43,136 $ 40,178
Long Lived Assets, net             32 64  
United Kingdom                  
Revenues from External Customers and Long-Lived Assets [Line Items]                  
Revenue             0 0  
Net loss             (19,215) (16,833)  
Assets             9,830 6,992  
Long Lived Assets, net             32 64  
United States                  
Revenues from External Customers and Long-Lived Assets [Line Items]                  
Net loss             (1,983) (1,624)  
Assets             $ 18,220 36,144  
Long Lived Assets, net               $ 0