Quarterly report pursuant to Section 13 or 15(d)

Changes in Initial Product Warranty Accrual and Expenses Under Initial and Extended Warranties (Detail)

v2.4.1.9
Changes in Initial Product Warranty Accrual and Expenses Under Initial and Extended Warranties (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Movement in Standard Product Warranty Accrual      
Initial warranty accrual, beginning balance $ 930us-gaap_StandardProductWarrantyAccrual $ 1,096us-gaap_StandardProductWarrantyAccrual  
Provision for estimated warranty cost 970us-gaap_StandardProductWarrantyAccrualWarrantiesIssued 148us-gaap_StandardProductWarrantyAccrualWarrantiesIssued  
Warranty expenditures (233)us-gaap_ProductWarrantyExpense (219)us-gaap_ProductWarrantyExpense  
Initial warranty accrual, ending balance 1,667us-gaap_StandardProductWarrantyAccrual 1,025us-gaap_StandardProductWarrantyAccrual  
Less warranty accrual, long-term 640us-gaap_ProductWarrantyAccrualNoncurrent 0us-gaap_ProductWarrantyAccrualNoncurrent 519us-gaap_ProductWarrantyAccrualNoncurrent
Total warranty accrual, current portion $ 1,027us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 1,025us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 930us-gaap_ProductWarrantyAccrualClassifiedCurrent