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Inventory - Schedule of Components of Inventories (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Sep. 30, 2020
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Inventory Disclosure [Abstract] |  |
Purchased parts and raw materials | $ 12,519 | $ 14,530
Work-in-process | 3,694 | 3,074
Finished goods | 3,997 | 3,942
Inventory, gross | 20,210 | 21,546
Excess and obsolete reserves | (3,821) | (4,269)
Inventory | $ 16,389 | $ 17,277

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