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Restructuring - Summary of Restructuring Liability (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Restructuring Reserve [Roll Forward] |
Balance at December 31, 2013 | $ 881 us-gaap_RestructuringReserve
Accruals | 7,760 nvtl_AdditionsToRestructuringReserve
Payments | (5,360)us-gaap_PaymentsForRestructuring
Share-based compensation | (1,298)nvtl_RestructuringChargesForSharedBasedCompensationAccelerationForTerminationOfChiefExecutiveOfficer
Balance at December 31, 2014 | 1,983 us-gaap_RestructuringReserve
Facility Exit Related Costs |
Restructuring Reserve [Roll Forward] |
Balance at December 31, 2013 | 881 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Accruals | 1,170 nvtl_AdditionsToRestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Payments | (1,819)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
2013 Initiatives | Employment Contract Costs |
Restructuring Reserve [Roll Forward] |
Balance at December 31, 2013 | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandThirteenRestructuringMember
Accruals | 1,713 nvtl_AdditionsToRestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandThirteenRestructuringMember
Payments | (1,713)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandThirteenRestructuringMember
Share-based compensation | 0 nvtl_RestructuringChargesForSharedBasedCompensationAccelerationForTerminationOfChiefExecutiveOfficer / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandThirteenRestructuringMember
Balance at December 31, 2014 | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandThirteenRestructuringMember
2013 Initiatives | Facility Exit Related Costs |
Restructuring Reserve [Roll Forward] |
Share-based compensation | 0 nvtl_RestructuringChargesForSharedBasedCompensationAccelerationForTerminationOfChiefExecutiveOfficer / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandThirteenRestructuringMember
Balance at December 31, 2014 | 232 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandThirteenRestructuringMember
2014 Initiatives | Employment Contract Costs |
Restructuring Reserve [Roll Forward] |
Balance at December 31, 2013 | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandFourteenRestructuringMember
Accruals | 3,579 nvtl_AdditionsToRestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandFourteenRestructuringMember
Payments | (1,828)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandFourteenRestructuringMember
Share-based compensation | 0 nvtl_RestructuringChargesForSharedBasedCompensationAccelerationForTerminationOfChiefExecutiveOfficer / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandFourteenRestructuringMember
Balance at December 31, 2014 | 1,751 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandFourteenRestructuringMember
2014 Initiatives | Share-based Compensation Costs |
Restructuring Reserve [Roll Forward] |
Balance at December 31, 2013 | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_SpecialTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandFourteenRestructuringMember
Accruals | 1,298 nvtl_AdditionsToRestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_SpecialTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandFourteenRestructuringMember
Payments | 0 us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_SpecialTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandFourteenRestructuringMember
Share-based compensation | (1,298)nvtl_RestructuringChargesForSharedBasedCompensationAccelerationForTerminationOfChiefExecutiveOfficer / us-gaap_RestructuringCostAndReserveAxis = us-gaap_SpecialTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandFourteenRestructuringMember
Balance at December 31, 2014 | $ 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_SpecialTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandFourteenRestructuringMember

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- Definition Additions during the period to the restructuring reserve. + References No definition available. + Details
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- Definition Restructuring Charges For Shared Based Compensation Acceleration For Termination Of Chief Executive Officer + References No definition available. + Details
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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Details
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- Details
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- Details
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- Details
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