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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 21,538 $ 18,648
Work-in-process 3,431 3,361
Finished goods 5,545 5,127
Net balance $ 30,514 $ 27,136