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Selected Balance Sheet Information (Schedule of Inventory) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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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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