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Leases (Schedule of supplemental balance sheet information related to leases) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Finance leases    
Property and equipment, gross $ 30 $ 30
Accumulated amortization (13) (7)
Property and equipment, net $ 17 $ 23
Weighted average remaining lease term 3 years  
Weighted average discount rate 7.00%