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Selected Balance Sheet Information (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Selected Balance Sheet Information [Abstract]        
Depreciation $ 42 $ 17 $ 112 $ 52