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, 2018
Mar. 31, 2017
Dec. 31, 2017
Movement in Standard Product Warranty Accrual      
Initial warranty accrual, beginning balance $ 1,190 $ 1,706  
Provision for estimated warranty cost 246 (23)  
Warranty expenditures (222) (223)  
Initial warranty accrual, ending balance 1,214 1,460  
Less warranty accrual, long-term 124 487 $ 70
Total warranty accrual, current portion $ 1,090 $ 973 $ 1,120