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Commitments and Contingencies - Additional Information (Detail) (USD $) | 0 Months Ended | 12 Months Ended | 0 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Nov. 17, 2014 | Jul. 08, 2014 | Jun. 23, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 31, 2014 | Mar. 31, 2015
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Rental expense under operating leases |  |  |  | $ 3,000,000 us-gaap_OperatingLeasesRentExpenseNet | $ 4,100,000 us-gaap_OperatingLeasesRentExpenseNet | $ 4,500,000 us-gaap_OperatingLeasesRentExpenseNet |  |
Purchase commitments |  |  |  | 55,000,000 us-gaap_LongTermPurchaseCommitmentAmount |  |  |  |
Period of time to achieve earnings and cash building targets |  |  |  | 6 months |  |  |  |
Accrued bonus liability |  |  |  | 5,500,000 us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability |  |  |  |
Loss Contingency, Damages Paid, Value |  |  | 6,000,000 us-gaap_LossContingencyDamagesPaidValue |  |  |  |  |
Consideration For Litigation Settlement Paid By Companys Insurers |  | 1,700,000 nvtl_ConsiderationForLitigationSettlementPaidByCompanysInsurers | 1,700,000 nvtl_ConsiderationForLitigationSettlementPaidByCompanysInsurers |  |  |  |  |
Legal Settlements Promissory Notes Issued Amount |  | 5,000,000 nvtl_LegalSettlementsPromissoryNotesIssuedAmount | 5,000,000 nvtl_LegalSettlementsPromissoryNotesIssuedAmount |  |  |  |  |
Amount for Share Price Fluctuation Related to Litigation Settlement | 789,600 nvtl_AmountForSharePriceFluctuationRelatedToLitigationSettlement |  |  |  |  |  |  |
Loss Contingency Damages Paid Net Of Portion Paid By Companys Insurers |  | 4,300,000 nvtl_LossContingencyDamagesPaidNetOfPortionPaidByCompanysInsurers |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Secured note maturity period |  |  |  |  |  |  | 5 years |
Company's unused borrowing capacity under credit facility |  |  |  | 25,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  | 25,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |
Line of Credit Facility, Amount Outstanding |  |  |  | 5,200,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |
Available borrowings |  |  |  | 12,100,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Company's unused borrowing capacity under credit facility |  |  |  | 3,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember |  |  |  |
Unrestricted Stock |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Legal Settlements Shares Issued Value |  | 5,000,000 nvtl_LegalSettlementsSharesIssuedValue / us-gaap_AwardTypeAxis = nvtl_UnrestrictedStockMember | 5,000,000 nvtl_LegalSettlementsSharesIssuedValue / us-gaap_AwardTypeAxis = nvtl_UnrestrictedStockMember |  |  |  |  |
Common Stock Distribution (shares) |  | 2,407,318 nvtl_CommonStockDistribution / us-gaap_AwardTypeAxis = nvtl_UnrestrictedStockMember |  |  |  |  |  |
Secured Promissory Note |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Secured note maturity period |  |  | 30 months |  |  |  |  |
Secured note interest rate percentage |  |  | 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_BalanceSheetLocationAxis = nvtl_SecuredPromissoryNoteMember |  |  |  |  |
Scenario, Forecast |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total estimated expense |  |  |  |  |  |  |  | $ 11,000,000 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember

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