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Inventories, Net - Inventories, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Inventory [Line Items]    
Total raw materials $ 2,867 $ 2,743
Total work-in-process 9,684 8,988
Total finished goods 2,762 3,243
Total inventories, net 15,313 14,974
Security Products    
Inventory [Line Items]    
Total raw materials 2,298 2,365
Total work-in-process 8,154 7,387
Total finished goods 2,076 2,440
Marine Components    
Inventory [Line Items]    
Total raw materials 569 378
Total work-in-process 1,530 1,601
Total finished goods $ 686 $ 803