Leases - Components of lease cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 2,777	$ 1,885	$ 1,990
Finance lease cost [Abstract]
Amortization of right-of-use assets	65	63	64
Interest on lease liabilities	14	18	22
Total lease cost	$ 2,856	$ 1,966	$ 2,076