Summary of Warranty Accrual Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Balance at beginning of period	$ 321	$ 407
Accruals for warranties charged to expense	59	55
Cost of warranty claims	(3)	(141)
Balance at end of period	$ 377	$ 321