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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Movement in Standard Product Warranty Accrual          
Balance, beginning of period $ 1,384 $ 1,214 $ 1,308 $ 1,190  
Provision for estimated warranty cost 383 378 622 624  
Warranty expenditures (268) (233) (431) (455)  
Balance, June 30 1,499 1,359 1,499 1,359  
Less warranty accrual, long-term 735 221 735 221 $ 447
Total warranty accrual, current portion $ 764 $ 1,138 $ 764 $ 1,138 $ 861