Inventories, Net - Inventories, Net (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Inventory [Line Items]
Total raw materials	$ 3,104	$ 2,941
Total work-in-process	12,237	11,771
Total finished goods	3,621	3,636
Total inventories, net	18,962	18,348
Security Products
Inventory [Line Items]
Total raw materials	2,397	2,134
Total work-in-process	9,549	9,138
Total finished goods	2,526	2,582
Marine Components
Inventory [Line Items]
Total raw materials	707	807
Total work-in-process	2,688	2,633
Total finished goods	$ 1,095	$ 1,054