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Fair Value Measurement of Assets and Liabilities - Summary of Company's Financial Instruments, Fair Value on a Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Fair Value, Measurements, Recurring |  |
Cash equivalents |  |
Total cash equivalents | $ 2,114 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueMeasurementsRecurringMember | $ 487 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueMeasurementsRecurringMember
Available-for-sale: |  |
Total short-term marketable securities |  | 19,178 us-gaap_ShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueMeasurementsRecurringMember
Total long-term marketable securities |  | 3,443 us-gaap_LongTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueMeasurementsRecurringMember
Total financial assets |  | 23,108 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueMeasurementsRecurringMember
Fair Value, Measurements, Recurring | Government agency securities |  |
Available-for-sale: |  |
Total short-term marketable securities |  | 2,351 us-gaap_ShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Fair Value, Measurements, Recurring | Municipal bonds |  |
Available-for-sale: |  |
Total short-term marketable securities |  | 2,829 us-gaap_ShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember
Fair Value, Measurements, Recurring | Certificates of deposit |  |
Available-for-sale: |  |
Total short-term marketable securities |  | 3,360 us-gaap_ShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember
Total long-term marketable securities |  | 1,300 us-gaap_LongTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember
Fair Value, Measurements, Recurring | Corporate debentures / bonds |  |
Available-for-sale: |  |
Total short-term marketable securities |  | 10,638 us-gaap_ShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = nvtl_CorporateDebenturesBondsMember
Total long-term marketable securities |  | 2,143 us-gaap_LongTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = nvtl_CorporateDebenturesBondsMember
Fair Value, Measurements, Recurring | Money market funds |  |
Cash equivalents |  |
Total cash equivalents | 1,134 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_FairValueByAssetClassAxis = us-gaap_MoneyMarketFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueMeasurementsRecurringMember |
Fair Value, Measurements, Recurring | US Treasury securities |  |
Cash equivalents |  |
Total cash equivalents |  | 487 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_FairValueByAssetClassAxis = us-gaap_USTreasurySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueMeasurementsRecurringMember
Fair Value, Measurements, Recurring | Certificates of deposit |  |
Cash equivalents |  |
Total cash equivalents | 980 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CertificatesOfDepositMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueMeasurementsRecurringMember |
Level 1 |  |
Cash equivalents |  |
Total cash equivalents | 1,134 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Available-for-sale: |  |
Total short-term marketable securities |  | 0 us-gaap_ShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Total long-term marketable securities |  | 0 us-gaap_LongTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Total financial assets |  | 0 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 1 | Government agency securities |  |
Available-for-sale: |  |
Total short-term marketable securities |  | 0 us-gaap_ShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Level 1 | Municipal bonds |  |
Available-for-sale: |  |
Total short-term marketable securities |  | 0 us-gaap_ShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember
Level 1 | Certificates of deposit |  |
Available-for-sale: |  |
Total short-term marketable securities |  | 0 us-gaap_ShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember
Total long-term marketable securities |  | 0 us-gaap_LongTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember
Level 1 | Corporate debentures / bonds |  |
Available-for-sale: |  |
Total short-term marketable securities |  | 0 us-gaap_ShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = nvtl_CorporateDebenturesBondsMember
Total long-term marketable securities |  | 0 us-gaap_LongTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = nvtl_CorporateDebenturesBondsMember
Level 1 | Money market funds |  |
Cash equivalents |  |
Total cash equivalents | 1,134 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_FairValueByAssetClassAxis = us-gaap_MoneyMarketFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
Level 1 | US Treasury securities |  |
Cash equivalents |  |
Total cash equivalents |  | 0 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_FairValueByAssetClassAxis = us-gaap_USTreasurySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 1 | Certificates of deposit |  |
Cash equivalents |  |
Total cash equivalents | 0 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CertificatesOfDepositMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
Level 2 |  |
Cash equivalents |  |
Total cash equivalents | 980 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 487 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Available-for-sale: |  |
Total short-term marketable securities |  | 19,178 us-gaap_ShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Total long-term marketable securities |  | 3,443 us-gaap_LongTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Total financial assets |  | 23,108 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 2 | Government agency securities |  |
Available-for-sale: |  |
Total short-term marketable securities |  | 2,351 us-gaap_ShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Level 2 | Municipal bonds |  |
Available-for-sale: |  |
Total short-term marketable securities |  | 2,829 us-gaap_ShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember
Level 2 | Certificates of deposit |  |
Available-for-sale: |  |
Total short-term marketable securities |  | 3,360 us-gaap_ShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember
Total long-term marketable securities |  | 1,300 us-gaap_LongTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember
Level 2 | Corporate debentures / bonds |  |
Available-for-sale: |  |
Total short-term marketable securities |  | 10,638 us-gaap_ShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = nvtl_CorporateDebenturesBondsMember
Total long-term marketable securities |  | 2,143 us-gaap_LongTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = nvtl_CorporateDebenturesBondsMember
Level 2 | Money market funds |  |
Cash equivalents |  |
Total cash equivalents | 0 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_FairValueByAssetClassAxis = us-gaap_MoneyMarketFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
Level 2 | US Treasury securities |  |
Cash equivalents |  |
Total cash equivalents |  | 487 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_FairValueByAssetClassAxis = us-gaap_USTreasurySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 2 | Certificates of deposit |  |
Cash equivalents |  |
Total cash equivalents | $ 980 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CertificatesOfDepositMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 + Details
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