Leases - Schedule of Operating Lease Costs and Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Operating lease costs	$ 596	$ 531	$ 1,192	$ 1,062
Operating cash flows from operating leases	632	537	1,324	1,124
Right-of-use asset obtained in exchange for lease liability	$ (14)	$ (14)	$ (28)	$ (30)