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Inventories (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw material $ 1,371 $ 1,649
Work-in-process 8,706 7,963
Finished goods 7,372 5,132
Supplies 771 723
Total inventories $ 18,220 $ 15,467