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Inventories - Schedule of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 8,488 $ 6,067
Work-in-process 11,774 12,487
Finished products 59,633 60,441
Deferred cost of sales   2,335
Inventories $ 79,895 $ 81,330