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Leases (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Leases [Abstract]    
Lease terms extending through year 2024  
Operating lease, Weighted average remaining lease term 3 years 6 months  
Operating lease, Weighted average discount rate 6.54%  
Operating lease costs $ 103 $ 95
Variable lease costs $ 84 $ 60