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Securities Purchase Agreement - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 17, 2014 | Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 08, 2014 | Nov. 16, 2014
Changes In Equity And Comprehensive Income Line Items [Line Items] |  |  |  |  |  |  |
Common stock shares issued at par value (per share) |  | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare |  |  |
Warrants to purchase common stock sold (shares) |  |  |  |  |  | 4,117,647 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |
Exercise price per share |  |  |  |  |  | 2.26 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights |
Proceeds from the issuances of Series C preferred and common stock, net of issuance costs |  |  | $ 14,163 us-gaap_ProceedsFromIssuanceOrSaleOfEquity | $ 0 us-gaap_ProceedsFromIssuanceOrSaleOfEquity | $ 0 us-gaap_ProceedsFromIssuanceOrSaleOfEquity |  |
Common stock, shares authorized | 100,000,000 us-gaap_CommonStockSharesAuthorized | 100,000,000 us-gaap_CommonStockSharesAuthorized | 100,000,000 us-gaap_CommonStockSharesAuthorized | 100,000,000 us-gaap_CommonStockSharesAuthorized |  |  | 50,000,000 us-gaap_CommonStockSharesAuthorized
Reclassification of warrant liability to equity | 8,219 us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued | 8,219 us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued | 8,219 us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued |  |  |  |
Expense on fair value warrants |  |  | 3,280 us-gaap_FairValueAdjustmentOfWarrants | 0 us-gaap_FairValueAdjustmentOfWarrants | 0 us-gaap_FairValueAdjustmentOfWarrants |  |
Common stock shares reserved for issuance |  | 14,660,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance | 14,660,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance | 10,209,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance |  |  |
2009 Omnibus Incentive Compensation Plan |  |  |  |  |  |  |
Changes In Equity And Comprehensive Income Line Items [Line Items] |  |  |  |  |  |  |
Unreserved shares previously approved for issuance |  |  |  |  |  | 1,651,455 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures / us-gaap_PlanNameAxis = nvtl_TwoThousandNineOmnibusIncentiveCompensationPlanMember |
2000 Stock Compensation Plan |  |  |  |  |  |  |
Changes In Equity And Comprehensive Income Line Items [Line Items] |  |  |  |  |  |  |
Unreserved shares previously approved for issuance |  |  |  |  |  | 1,300,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures / us-gaap_PlanNameAxis = nvtl_TwoThousandStockCompensationPlanMember |
Series C Preferred Stock |  |  |  |  |  |  |
Changes In Equity And Comprehensive Income Line Items [Line Items] |  |  |  |  |  |  |
Number of shares sold |  |  |  |  |  | 87,196 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |
Convertible preferred stock par value per share |  |  |  |  |  | 0.001 us-gaap_TemporaryEquityParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |
Number of shares sold, Per share price |  |  |  |  |  | 17.50 us-gaap_SharesIssuedPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |
Proceeds from the issuances of Series C preferred and common stock, net of issuance costs |  |  |  |  |  | 14,400 us-gaap_ProceedsFromIssuanceOrSaleOfEquity / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |
Convertible Preferred Stock, Shares Issued upon Conversion |  |  |  |  |  | 10 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |
Beneficial conversion feature |  |  |  |  |  | 445 us-gaap_PreferredStockLiquidationPreferenceValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |
Series C Convertible Preferred Stock |  |  |  |  |  |  |
Changes In Equity And Comprehensive Income Line Items [Line Items] |  |  |  |  |  |  |
Common stock shares reserved for issuance |  |  |  |  |  | 871,960 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember |
Scenario, Plan |  |  |  |  |  |  |
Changes In Equity And Comprehensive Income Line Items [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  |  | 100,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPlanMember |
Common Stock |  |  |  |  |  |  |
Changes In Equity And Comprehensive Income Line Items [Line Items] |  |  |  |  |  |  |
Number of shares sold |  |  | 7,363,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 7,363,334 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
Common stock shares issued at par value (per share) |  |  |  |  |  | 0.001 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
Number of shares sold, Per share price |  |  |  |  |  | 1.75 us-gaap_SharesIssuedPricePerShare / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
Common stock warrants outstanding |  |  |  |  |  |  |
Changes In Equity And Comprehensive Income Line Items [Line Items] |  |  |  |  |  |  |
Warrants to purchase common stock sold (shares) |  |  |  |  |  | 4,117,647 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember |
Exercise price per share |  |  |  |  |  | 2.26 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember |

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