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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventories    
Finished goods $ 9,203 $ 7,513
Work-in-process 12,065 9,596
Raw materials 21,150 17,680
Less: Inventory reserves (5,822) (6,137)
Inventories, net $ 36,596 $ 28,652