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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
May 31, 2021
Aug. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Oct. 31, 2000
Leases          
Lease term extension   2 years      
Operating lease expense     $ 200 $ 400  
Right-of-use lease asset     $ 30 $ 1,227  
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