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Financial Statement Details - Summary of Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Royalties $ 4,035us-gaap_AccruedRoyaltiesCurrent $ 4,243us-gaap_AccruedRoyaltiesCurrent  
Payroll and related expenses 8,038us-gaap_EmployeeRelatedLiabilitiesCurrent 4,828us-gaap_EmployeeRelatedLiabilitiesCurrent  
Product warranty 1,196us-gaap_ProductWarrantyAccrual 2,244us-gaap_ProductWarrantyAccrual 2,329us-gaap_ProductWarrantyAccrual
Market development funds and price protection 2,502nvtl_MarketDevelopmentFundAndPriceProtection 3,059nvtl_MarketDevelopmentFundAndPriceProtection  
Professional fees 780us-gaap_AccruedProfessionalFeesCurrent 1,040us-gaap_AccruedProfessionalFeesCurrent  
Deferred revenue 962us-gaap_DeferredRevenue 2,999us-gaap_DeferredRevenue  
Restructuring 1,886us-gaap_RestructuringReserveCurrent 610us-gaap_RestructuringReserveCurrent  
Other 4,445us-gaap_OtherAccruedLiabilitiesCurrent 4,248us-gaap_OtherAccruedLiabilitiesCurrent  
Accrued expenses, Total $ 23,844us-gaap_AccruedLiabilitiesCurrent $ 23,271us-gaap_AccruedLiabilitiesCurrent