Revenue recognition - Schedule of Disaggregates Net Sales By Reporting Unit (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation Of Revenue [Line Items]
Net sales	$ 42,864	$ 34,556	$ 126,589	$ 106,733
Security Products
Disaggregation Of Revenue [Line Items]
Net sales	28,493	25,829	86,911	79,301
Marine Components
Disaggregation Of Revenue [Line Items]
Net sales	$ 14,371	$ 8,727	$ 39,678	$ 27,432