Revenue Recognition - Schedule of Disaggregates Net Sales By Reporting Unit (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation Of Revenue [Line Items]
Net sales	$ 34,556	$ 28,426	$ 106,733	$ 84,537
Security Products
Disaggregation Of Revenue [Line Items]
Net sales	25,829	21,209	79,301	65,251
Marine Components
Disaggregation Of Revenue [Line Items]
Net sales	$ 8,727	$ 7,217	$ 27,432	$ 19,286