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Schedule of Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Inventory [Line Items]    
Raw materials $ 24,937 $ 22,351
Work-in-process 5,185 4,083
Finished products 12,141 12,570
Total inventories, net $ 42,263 $ 39,004