Income Taxes - Components of Income (Loss) Before Expense for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments [Abstract]
Domestic									$ 4,447	$ 4,250
Foreign									(1,001)	(460)
INCOME BEFORE INCOME TAXES	$ 1,875	$ 1,051	$ 1,200	$ (680)	$ 1,814	$ 1,334	$ 949	$ (307)	$ 3,446	$ 3,790