Leases - Schedule of Operating Lease Costs and Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Operating lease costs	$ 596	$ 531	$ 1,788	$ 1,593
Operating cash flows from operating leases	632	556	1,994	1,680
Right-of-use asset obtained in exchange for lease liability	$ (14)	$ 29	$ (42)	$ (1)