Quarterly report pursuant to Section 13 or 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
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Movement in Standard Product Warranty Accrual      
Balance, beginning of period $ 1,132 $ 1,110  
Provision for estimated warranty cost 664 203  
Warranty expenditures (400) (156)  
Balance, end of period 1,396 1,157  
Less: long-term portion of warranty accrual 297 246 $ 384
Current portion of warranty accrual $ 1,099 $ 911 $ 748