Income Taxes - Summary of Gross Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Gross unrecognized tax benefits at beginning of year	$ 957	$ 869
Gross (decreases) increases in tax positions for prior years	(2)	45
Gross increases in tax positions for current year	236	256
Lapse of statute of limitations	(139)	(213)
Gross unrecognized tax benefits at end of year	$ 1,052	$ 957