Summary of Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current provision:
Federal		$ 4
State	$ (40)	624		$ (521)
Foreign	181	680		1,050
Total current provision	141	1,308		$ 1,571
Deferred benefit:
Federal			$ (15)
State			(5)
Foreign	(309)	(245)	(356)
Total deferred benefit	(309)	(245)	(376)
Total current provision	$ (168)	$ 1,063	$ 1,195