Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income tax (benefit) expense	$ 789,000	$ 1,504,000	$ 788,000	$ 3,354,000
Unrecognized tax benefits, period change			0
Interest and penalties related to uncertain tax positions			$ 0