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Balance Sheet Details - Summary of Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Royalties $ 6,518us-gaap_AccruedRoyaltiesCurrent $ 4,035us-gaap_AccruedRoyaltiesCurrent    
Payroll and related expenses 15,057us-gaap_EmployeeRelatedLiabilitiesCurrent 8,038us-gaap_EmployeeRelatedLiabilitiesCurrent    
Product warranty 851us-gaap_ProductWarrantyAccrual 1,196us-gaap_ProductWarrantyAccrual 1,367us-gaap_ProductWarrantyAccrual 2,244us-gaap_ProductWarrantyAccrual
Market development funds and price protection 2,782nvtl_MarketDevelopmentFundAndPriceProtection 2,502nvtl_MarketDevelopmentFundAndPriceProtection    
Professional fees 1,217us-gaap_AccruedProfessionalFeesCurrent 780us-gaap_AccruedProfessionalFeesCurrent    
Deferred revenue 929us-gaap_DeferredRevenue 962us-gaap_DeferredRevenue    
Restructuring 83us-gaap_RestructuringReserveCurrent 1,886us-gaap_RestructuringReserveCurrent    
Other 4,559us-gaap_OtherAccruedLiabilitiesCurrent 4,445us-gaap_OtherAccruedLiabilitiesCurrent    
Accrued expenses, Total $ 31,996us-gaap_AccruedLiabilitiesCurrent $ 23,844us-gaap_AccruedLiabilitiesCurrent