Benefit plans - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, matching amount	$ 700,000	$ 800,000
Regular Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, matching percentage	2.50%
Net periodic benefit cost	$ 100,000	200,000
Projected benefit obligation	1,300,000	1,200,000
Projected benefit obligation, plan assets	1,300,000	1,200,000
Net pension liability	100,000	100,000
Actuarial gain (loss)	62,000	40,000
Company contributions	200,000
Estimates future benefit payments from 2025 to 2028	300,000
Estimates future benefit payments, 2029 and thereafter	$ 900,000
Top Hat Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan legal yield guarantee percent	1.75%
Net periodic benefit cost	$ 200,000	200,000
Projected benefit obligation	2,100,000	2,000,000
Projected benefit obligation, plan assets	1,900,000	1,800,000
Net pension liability	200,000	200,000
Actuarial gain (loss)	14,000	$ 3,000
Company contributions	200,000
Estimates future benefit payments from 2025 to 2028	400,000
Estimates future benefit payments, 2029 and thereafter	$ 1,200