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Leasehold Improvements and Equipment (Narrative) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Net $ 5,163 $ 5,213
Asset not yet in service [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Net $ 1,881 $ 1,832