Leases - Components of Lease Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Operating lease cost	$ 1,267	$ 1,291	$ 2,526	$ 2,586
Short-term lease cost	61	65	122	128
Variable lease cost	(1)	1	(3)	6
Sublease income	(11)	(35)	(24)	(69)
Total lease cost	$ 1,316	$ 1,322	$ 2,621	$ 2,651