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Inventories, Net - Inventories, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Inventory [Line Items]    
Total raw materials $ 4,996 $ 3,220
Total work-in-process 15,048 11,668
Total finished goods 3,492 3,449
Total inventories, net 23,536 18,337
Security Products    
Inventory [Line Items]    
Total raw materials 3,768 2,318
Total work-in-process 11,088 9,214
Total finished goods 2,183 2,235
Marine Components    
Inventory [Line Items]    
Total raw materials 1,228 902
Total work-in-process 3,960 2,454
Total finished goods $ 1,309 $ 1,214