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Inventories, Net - Inventories, Net (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Inventory [Line Items]    
Total raw materials $ 3,223 $ 2,661
Total work-in-process 11,409 11,130
Total finished goods 3,198 3,311
Total inventories, net 17,830 17,102
Security Products    
Inventory [Line Items]    
Total raw materials 2,390 2,001
Total work-in-process 9,174 9,018
Total finished goods 2,294 2,363
Marine Components    
Inventory [Line Items]    
Total raw materials 833 660
Total work-in-process 2,235 2,112
Total finished goods $ 904 $ 948