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Inventories - Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Inventory [Line Items]    
Total raw materials $ 2,661 $ 2,730
Total work-in-process 11,130 9,836
Total finished goods 3,311 2,816
Total inventories 17,102 15,382
Security Products    
Inventory [Line Items]    
Total raw materials 2,001 2,156
Total work-in-process 9,018 8,290
Total finished goods 2,363 2,079
Marine Components    
Inventory [Line Items]    
Total raw materials 660 574
Total work-in-process 2,112 1,546
Total finished goods $ 948 $ 737