Accounts receivable, net - Schedule of Accounts receivable, net (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Accounts Notes And Loans Receivable [Line Items]
Allowance for doubtful accounts	$ (70)	$ (70)
Total accounts receivable, net	15,435	17,061
Security Products
Accounts Notes And Loans Receivable [Line Items]
Accounts receivable, gross	12,596	14,950
Marine Components
Accounts Notes And Loans Receivable [Line Items]
Accounts receivable, gross	$ 2,909	$ 2,181