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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Inventory Net [Abstract]
Raw materials	$ 15,819	$ 18,444
Work in process	6,098	3,182
Finished goods	807	940
Obsolescence allowance	(1,907)	(1,597)
Total inventories	$ 20,817	$ 20,969

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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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