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Inventories - Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Inventory [Line Items]    
Total raw materials $ 2,743 $ 2,807
Total work-in-process 8,988 9,346
Total finished goods 3,243 2,945
Total inventories, net 14,974 15,098
Security Products    
Inventory [Line Items]    
Total raw materials 2,365 2,426
Total work-in-process 7,387 7,732
Total finished goods 2,440 2,041
Marine Components    
Inventory [Line Items]    
Total raw materials 378 381
Total work-in-process 1,601 1,614
Total finished goods $ 803 $ 904