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, 2019
Mar. 31, 2018
Dec. 31, 2018
Movement in Standard Product Warranty Accrual      
Balance, January 1 $ 1,308 $ 1,190  
Provision for estimated warranty cost 239 246  
Warranty expenditures (163) (222)  
Balance, March 31 1,384 1,214  
Less warranty accrual, long-term 577 124 $ 447
Total warranty accrual, current portion $ 807 $ 1,090 $ 861