Leases - Schedule of components of lease expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 3,450	$ 3,612
Finance lease cost:
Amortization of right-of-use assets	308	309
Interest on lease liability	(338)	(360)
Total finance lease cost	646	669
Total lease cost	$ 4,096	$ 4,281