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Inventories, Net - Inventories, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventory [Line Items]    
Total raw materials $ 3,313 $ 2,661
Total work-in-process 11,952 11,130
Total finished goods 3,561 3,311
Total inventories, net 18,826 17,102
Security Products    
Inventory [Line Items]    
Total raw materials 2,505 2,001
Total work-in-process 9,258 9,018
Total finished goods 2,603 2,363
Marine Components    
Inventory [Line Items]    
Total raw materials 808 660
Total work-in-process 2,694 2,112
Total finished goods $ 958 $ 948