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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Apr. 30, 2022
May 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Oct. 31, 2000
Leases          
Operating lease expense     $ 100 $ 200  
Right-of-use lease asset     $ 142 $ 30  
Dundee facility          
Leases          
Lease term for research and development facility         25 years
Right-of-use lease asset   $ 1,100      
Lease liability   1,200      
General and administrative expenses   100      
Costs relating to assignment of lease   $ 400      
Berkeley Heights Facility [Member]          
Leases          
Lease term extension 3 years