Leases - Summary of Operating Lease Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Lease Cost [Abstract]
Lease cost	$ 560	$ 533	$ 1,120	$ 1,061
Sublease income	(151)	(151)	(301)	(301)
Total lease cost	$ 409	$ 382	$ 819	$ 760