Accounts receivable, net - Schedule of Accounts receivable, net (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items]
Allowance for doubtful accounts	$ (70)	$ (70)
Total accounts receivable, net	17,061	17,840
Security Products
Accounts Notes And Loans Receivable [Line Items]
Accounts receivable, gross	14,950	13,767
Marine Components
Accounts Notes And Loans Receivable [Line Items]
Accounts receivable, gross	$ 2,181	$ 4,143