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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Inventory Net [Abstract]
Raw materials	$ 18,444	$ 17,889
Work in process	3,182	3,986
Finished goods	940	1,508
Obsolescence allowance	(1,597)	(1,896)
Total inventories	$ 20,969	$ 21,487

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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.

+ References

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-Publisher FASB
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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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

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