Leases - Supplemental Cash Flow Information Related to Operating Leases (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash paid for amount included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 746	$ 744
Right-of-use assets obtained in exchange for new operating lease liabilities		$ 1,304