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Inventories, Net - Schedule of Inventories, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 3,313 $ 2,661
Work in process 11,952 11,130
Finished products 3,561 3,311
Total $ 18,826 $ 17,102