Supplemental Balance Sheet Information - Components of Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021
Inventory Disclosure [Abstract]
Raw materials	$ 4,896	$ 4,165
Work-in process	1,650	1,295
Finished products	1,744	1,300
Total	$ 8,290	$ 6,760

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