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Restructuring - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended | 16 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2014 employee | Mar. 31, 2014 employee | Feb. 28, 2014 employee | Dec. 31, 2014
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | $ 7,760,000 us-gaap_RestructuringCharges | $ 3,304,000 us-gaap_RestructuringCharges | $ 0 us-gaap_RestructuringCharges |  |  |  |
Restructuring | 1,886,000 us-gaap_RestructuringReserveCurrent | 610,000 us-gaap_RestructuringReserveCurrent |  |  |  |  | 1,886,000 us-gaap_RestructuringReserveCurrent
Restructuring Reserve, Noncurrent | 60,000 us-gaap_RestructuringReserveNoncurrent |  |  |  |  |  | 60,000 us-gaap_RestructuringReserveNoncurrent
2013 Initiatives |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Reduction in number of employees after restructuring |  |  |  | 5 us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandThirteenRestructuringMember | 21 us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandThirteenRestructuringMember | 41 us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandThirteenRestructuringMember |
Restructuring charges | 2,900,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandThirteenRestructuringMember | 3,300,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandThirteenRestructuringMember |  |  |  |  |
Restructuring costs to date |  |  |  |  |  |  | 6,200,000 us-gaap_RestructuringAndRelatedCostCostIncurredToDate / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandThirteenRestructuringMember
2014 Initiatives |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | 4,900,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandFourteenRestructuringMember |  |  |  |  |  |
Employment Contract Costs | 2013 Initiatives |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | 1,700,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandThirteenRestructuringMember |  |  |  |  |  |
Facility Exit Related Costs | 2013 Initiatives |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | 1,200,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandThirteenRestructuringMember |  |  |  |  |  |
Share-based Compensation Costs | 2014 Initiatives |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | $ 1,300,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_SpecialTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = nvtl_TwoThousandFourteenRestructuringMember |  |  |  |  |  |

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- Definition Amount of costs incurred to date for the specified type of restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: 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 3: 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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- Definition The number of positions eliminated during the period as a result of restructuring activities. + References No definition available. + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: 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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- Definition Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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- Definition Carrying amount as of the balance sheet date of known and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid after one year or beyond the next operating cycle, if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Paragraph Question 4 + Details
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