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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]            
Finished goods $ 10,953   $ 13,737      
Semi-finished goods and work-in-process 35,862   53,148      
Raw materials 14,502   12,445      
Materials in-transit 838   134      
Less: inventory reserve (4,699) $ (4,672) (6,391) $ (5,297) $ (7,966) $ (7,177)
Inventories, net $ 57,456   $ 73,073