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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 26,247 $ 18,648
Work-in-process 2,774 3,361
Finished goods 4,862 5,127
Net balance $ 33,883 $ 27,136