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Inventories - Components of Inventories (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Sep. 30, 2019
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Inventory Disclosure [Abstract] |  |
Raw materials | $ 2,409 | $ 2,034
Work-in process | 1,349 | 892
Finished products | 1,193 | 1,575
Total | $ 4,951 | $ 4,501

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