Unrecognized tax benefit (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Beginning Balance	$ 2,955	$ 1,871
Increase/(Decrease) of unrecognized tax benefits taken in prior years		(295)
Increase/(Decrease) of unrecognized tax benefits related to current year	1,749	1,379
Ending Balance	$ 4,704	$ 2,955