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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Movement in Standard Product Warranty Accrual          
Initial warranty accrual, beginning balance $ 1,667 $ 1,025 $ 1,449 $ 1,096  
Provision for estimated warranty cost 545 461 996 609  
Warranty expenditures (215) (231) (448) (450)  
Initial warranty accrual, ending balance 1,997 1,255 1,997 1,255  
Less warranty accrual, long-term 868 247 868 247 $ 519
Total warranty accrual, current portion $ 1,129 $ 1,008 $ 1,129 $ 1,008 $ 930