Annual report pursuant to Section 13 and 15(d)

Changes in Initial Product Warranty Accrual and Expenses Under Initial and Extended Warranties (Detail)

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Changes in Initial Product Warranty Accrual and Expenses Under Initial and Extended Warranties (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Movement in Standard Product Warranty Accrual      
Balance, January 1 $ 1,132 $ 1,110 $ 1,308
Provision for estimated warranty cost 1,747 1,047 806
Warranty expenditures (1,793) (1,025) (1,004)
Balance, December 31 1,086 1,132 1,110
Less: long-term portion of warranty accrual 521 384 245
Current portion of warranty accrual $ 565 $ 748 $ 865