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Property and Equipment (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Property and Equipment        
Depreciation expense $ 600 $ 400 $ 1,512 $ 1,223