Leases - Summary of Operating Lease Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lease Cost [Abstract]
Lease cost	$ 533	$ 436	$ 1,061	$ 790
Sublease income	(151)	(151)	(301)	(301)
Total lease cost	$ 382	$ 285	$ 760	$ 489