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Schedule of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventory [Line Items]    
Raw materials $ 29,197 $ 24,937
Work-in-process 5,438 5,185
Finished products 16,944 12,141
Total inventories, net $ 51,579 $ 42,263