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Financial Statement Details - Summary of Marketable Securities Available-for-Sale (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 22,616 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Gross Unrealized Gains |  | 5 nvtl_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Gross Unrealized Losses |  | 0 nvtl_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Estimated Fair Value |  | 22,621 us-gaap_AvailableForSaleSecurities
Short-term marketable securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 19,173 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = nvtl_ShortTermMarketableSecuritiesMember
Gross Unrealized Gains |  | 5 nvtl_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = nvtl_ShortTermMarketableSecuritiesMember
Gross Unrealized Losses |  | 0 nvtl_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = nvtl_ShortTermMarketableSecuritiesMember
Estimated Fair Value |  | 19,178 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = nvtl_ShortTermMarketableSecuritiesMember
Long-term marketable securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 3,443 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = nvtl_LongTermMarketableSecuritiesMember
Gross Unrealized Gains |  | 0 nvtl_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = nvtl_LongTermMarketableSecuritiesMember
Gross Unrealized Losses |  | 0 nvtl_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = nvtl_LongTermMarketableSecuritiesMember
Estimated Fair Value |  | 3,443 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = nvtl_LongTermMarketableSecuritiesMember
Government agency securities | Short-term marketable securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maturity in Years |  | 1 or less
Amortized Cost |  | 2,350 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = nvtl_ShortTermMarketableSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Gross Unrealized Gains |  | 1 nvtl_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = nvtl_ShortTermMarketableSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Gross Unrealized Losses |  | 0 nvtl_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = nvtl_ShortTermMarketableSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Estimated Fair Value |  | 2,351 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = nvtl_ShortTermMarketableSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Municipal bonds | Short-term marketable securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maturity in Years |  | 1 or less
Amortized Cost |  | 2,828 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = nvtl_ShortTermMarketableSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember
Gross Unrealized Gains |  | 1 nvtl_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = nvtl_ShortTermMarketableSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember
Gross Unrealized Losses |  | 0 nvtl_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = nvtl_ShortTermMarketableSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember
Estimated Fair Value |  | 2,829 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = nvtl_ShortTermMarketableSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember
Certificates of deposit | Short-term marketable securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maturity in Years |  | 1 or less
Amortized Cost |  | 3,360 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = nvtl_ShortTermMarketableSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember
Gross Unrealized Gains |  | 0 nvtl_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = nvtl_ShortTermMarketableSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember
Gross Unrealized Losses |  | 0 nvtl_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = nvtl_ShortTermMarketableSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember
Estimated Fair Value |  | 3,360 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = nvtl_ShortTermMarketableSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember
Certificates of deposit | Long-term marketable securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maturity in Years |  | 1 to 2
Amortized Cost |  | 1,300 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = nvtl_LongTermMarketableSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember
Gross Unrealized Gains |  | 0 nvtl_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = nvtl_LongTermMarketableSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember
Gross Unrealized Losses |  | 0 nvtl_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = nvtl_LongTermMarketableSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember
Estimated Fair Value |  | 1,300 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = nvtl_LongTermMarketableSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember
Corporate debentures / bonds | Short-term marketable securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maturity in Years |  | 1 or less
Amortized Cost |  | 10,635 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = nvtl_ShortTermMarketableSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = nvtl_CorporateDebenturesBondsMember
Gross Unrealized Gains |  | 3 nvtl_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = nvtl_ShortTermMarketableSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = nvtl_CorporateDebenturesBondsMember
Gross Unrealized Losses |  | 0 nvtl_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = nvtl_ShortTermMarketableSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = nvtl_CorporateDebenturesBondsMember
Estimated Fair Value |  | 10,638 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = nvtl_ShortTermMarketableSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = nvtl_CorporateDebenturesBondsMember
Corporate debentures / bonds | Long-term marketable securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maturity in Years |  | 1 to 2
Amortized Cost |  | 2,143 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = nvtl_LongTermMarketableSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = nvtl_CorporateDebenturesBondsMember
Gross Unrealized Gains |  | 0 nvtl_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = nvtl_LongTermMarketableSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = nvtl_CorporateDebenturesBondsMember
Gross Unrealized Losses |  | 0 nvtl_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = nvtl_LongTermMarketableSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = nvtl_CorporateDebenturesBondsMember
Estimated Fair Value |  | 2,143 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = nvtl_LongTermMarketableSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = nvtl_CorporateDebenturesBondsMember
Minimum | Certificates of deposit | Long-term marketable securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Long Term Investments Maturity Period | 1 year | 1 year
Minimum | Corporate debentures / bonds | Long-term marketable securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Long Term Investments Maturity Period | 1 year | 1 year
Maximum | Certificates of deposit | Long-term marketable securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Long Term Investments Maturity Period | 2 years | 2 years
Maximum | Corporate debentures / bonds | Long-term marketable securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Long Term Investments Maturity Period | 2 years | 2 years

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