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Inventories - Schedule of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Raw materials $ 4,809 $ 4,976
Work-in-process 7,838 5,087
Finished products 48,358 42,947
Deferred cost of sales 4,008 4,553
Total inventory $ 65,013 $ 57,563