Leases - Other 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]
Cash paid for amounts included in the measurement of operating lease liabilities	$ 331	$ 259	$ 774	$ 781
Right-of-use assets obtained in exchange for new operating lease liabilities(1)	$ 0	$ 0	$ 1,353	$ 6,720