Income Taxes - Components of Provision for (Benefit from) Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current provision for (benefit from) income taxes:
State	$ 4	$ 2	$ 0
Foreign	42	13	12
Total current provision for (benefit from) income taxes	$ 46	$ 15	$ 12