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Inventories - Schedule of Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 5,889 $ 6,067
Work-in-process 13,666 12,487
Finished products 58,131 60,441
Deferred cost of sales   2,335
Inventories $ 77,686 $ 81,330