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, 2020
Mar. 31, 2019
Dec. 31, 2019
Movement in Standard Product Warranty Accrual      
Balance, January 1 $ 1,110 $ 1,308  
Provision for estimated warranty cost 203 239  
Warranty expenditures (156) (163)  
Balance, March 31 1,157 1,384  
Less warranty accrual, long-term 246 577 $ 245
Total warranty accrual, current portion $ 911 $ 807 $ 865