Selected Balance Sheet Information (Schedule of Inventory) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Selected Balance Sheet Information [Abstract]
Raw material	$ 1,083	$ 1,361
Work-in-process	287	321
Finished goods	2,070	1,661
Total inventory	$ 3,440	$ 3,343

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