Schedule II-Valuation And Qualifying Accounts And Reserve (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts receivable allowance
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	$ 356	$ 6	$ 126
Additions/ Charged to Expense	0	356	179
Deductions	0	(6)	(299)
Balance at End of Period	356	356	6
Warranty allowance
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	1,663	1,390	863
Additions/ Charged to Expense	418		1,386
Deductions	(911)	(755)	(859)
Balance at End of Period	$ 1,170	$ 1,663	$ 1,390