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Income Taxes - Summary of Provision (Benefit) for Income Taxes Reconciles to Amount Computed by Applying Statutory Federal Income Tax Rate (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Disclosure [Abstract] |  |  |
Federal tax benefit, at statutory rate | $ (13,447)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ (14,732)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ (30,142)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State benefit, net of federal benefit | (1,054)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | (922)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | (757)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Change in valuation allowance | 11,316 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 15,577 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 27,486 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Change in fair value of warrant | 1,203 nvtl_IncomeTaxReconciliationBusinessCombination | 0 nvtl_IncomeTaxReconciliationBusinessCombination | 0 nvtl_IncomeTaxReconciliationBusinessCombination
Beneficial conversion feature | 163 nvtl_EffectiveIncomeTaxReconciliationBeneficialConversionFeature | 0 nvtl_EffectiveIncomeTaxReconciliationBeneficialConversionFeature | 0 nvtl_EffectiveIncomeTaxReconciliationBeneficialConversionFeature
Research and development credits | 3 us-gaap_IncomeTaxReconciliationTaxCreditsResearch | (1,084)us-gaap_IncomeTaxReconciliationTaxCreditsResearch | (856)us-gaap_IncomeTaxReconciliationTaxCreditsResearch
Share-based compensation | 2,402 us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | 2,433 us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | 1,616 us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Uncertain tax positions | (62)nvtl_IncomeTaxReconciliationChangeInUncertainTaxPositions | (307)nvtl_IncomeTaxReconciliationChangeInUncertainTaxPositions | (46)nvtl_IncomeTaxReconciliationChangeInUncertainTaxPositions
Goodwill impairment | 0 us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses | 0 us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses | 3,700 us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses
Change in state apportionment | (347)nvtl_ChangeInStateApportionment | (767)nvtl_ChangeInStateApportionment | 0 nvtl_ChangeInStateApportionment
Other | (53)us-gaap_IncomeTaxReconciliationDeductionsOther | (115)us-gaap_IncomeTaxReconciliationDeductionsOther | (390)us-gaap_IncomeTaxReconciliationDeductionsOther
Provision or income taxes | $ 124 us-gaap_IncomeTaxExpenseBenefit | $ 83 us-gaap_IncomeTaxExpenseBenefit | $ 611 us-gaap_IncomeTaxExpenseBenefit

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e32123-109318 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other deductions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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