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Inventories, Net - Inventories, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventory [Line Items]    
Total raw materials $ 3,001 $ 2,730
Total work-in-process 10,864 9,836
Total finished goods 3,294 2,816
Total inventories, net 17,159 15,382
Security Products    
Inventory [Line Items]    
Total raw materials 2,236 2,156
Total work-in-process 8,760 8,290
Total finished goods 2,362 2,079
Marine Components    
Inventory [Line Items]    
Total raw materials 765 574
Total work-in-process 2,104 1,546
Total finished goods $ 932 $ 737