Leases and Contingencies - Summary of Lease Costs (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating Lease Liabilities Payments Due [Abstract]
Operating lease expense	$ 988	$ 964	$ 2,881	$ 2,914
Short-term lease expense	13	22	67	64
Total lease expense	$ 1,001	$ 986	$ 2,948	$ 2,978