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, 2017
Mar. 31, 2016
Dec. 31, 2016
Movement in Standard Product Warranty Accrual      
Initial warranty accrual, beginning balance $ 1,706 $ 2,188  
Provision for estimated warranty cost (23) 61  
Warranty expenditures (223) (189)  
Initial warranty accrual, ending balance 1,460 2,060  
Less warranty accrual, long-term 487 973 $ 773
Total warranty accrual, current portion $ 973 $ 1,087 $ 933