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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Inventory Net [Abstract]
Raw materials	$ 14,603	$ 14,262
Work in process	5,916	5,594
Finished goods	945	496
Obsolescence allowance	(2,855)	(3,009)
Total inventories	$ 18,609	$ 17,343

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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