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Inventory - Schedule of Components of Inventory (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
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Inventory Disclosure [Abstract] |  |
Purchased parts and raw materials | $ 14,530 | $ 15,192
Work-in-process | 3,074 | 4,215
Finished goods | 3,942 | 3,183
Inventory, gross | 21,546 | 22,590
Excess and obsolete reserves | (4,269) | (5,058)
Inventory | $ 17,277 | $ 17,532

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