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Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Statement [Abstract] |  |  |
Net revenues | $ 185,245 us-gaap_Revenues | $ 335,053 us-gaap_Revenues | $ 344,288 us-gaap_Revenues
Cost of net revenues | 148,198 us-gaap_CostOfRevenue | 266,759 us-gaap_CostOfRevenue | 271,845 us-gaap_CostOfRevenue
Gross profit | 37,047 us-gaap_GrossProfit | 68,294 us-gaap_GrossProfit | 72,443 us-gaap_GrossProfit
Operating costs and expenses: |  |  |
Research and development | 34,314 us-gaap_ResearchAndDevelopmentExpense | 48,246 us-gaap_ResearchAndDevelopmentExpense | 60,422 us-gaap_ResearchAndDevelopmentExpense
Sales and marketing | 13,792 us-gaap_SellingAndMarketingExpense | 20,898 us-gaap_SellingAndMarketingExpense | 27,501 us-gaap_SellingAndMarketingExpense
General and administrative | 15,402 us-gaap_GeneralAndAdministrativeExpense | 24,179 us-gaap_GeneralAndAdministrativeExpense | 22,668 us-gaap_GeneralAndAdministrativeExpense
Goodwill and intangible assets impairment | 0 us-gaap_GoodwillAndIntangibleAssetImpairment | 0 us-gaap_GoodwillAndIntangibleAssetImpairment | 49,521 us-gaap_GoodwillAndIntangibleAssetImpairment
Amortization of purchased intangible assets | 562 us-gaap_AmortizationOfIntangibleAssets | 562 us-gaap_AmortizationOfIntangibleAssets | 1,074 us-gaap_AmortizationOfIntangibleAssets
Shareholder litigation loss | 790 nvtl_ContingentLossForLitigation | 14,326 nvtl_ContingentLossForLitigation | 0 nvtl_ContingentLossForLitigation
Restructuring charges | 7,760 us-gaap_RestructuringCharges | 3,304 us-gaap_RestructuringCharges | 0 us-gaap_RestructuringCharges
Total operating costs and expenses | 72,620 us-gaap_OperatingExpenses | 111,515 us-gaap_OperatingExpenses | 161,186 us-gaap_OperatingExpenses
Operating loss | (35,573)us-gaap_OperatingIncomeLoss | (43,221)us-gaap_OperatingIncomeLoss | (88,743)us-gaap_OperatingIncomeLoss
Other income (expense): |  |  |
Change in fair value of warrant liability | (3,280)us-gaap_FairValueAdjustmentOfWarrants | 0 us-gaap_FairValueAdjustmentOfWarrants | 0 us-gaap_FairValueAdjustmentOfWarrants
Interest income (expense), net | (85)us-gaap_InterestIncomeExpenseNonoperatingNet | 113 us-gaap_InterestIncomeExpenseNonoperatingNet | 291 us-gaap_InterestIncomeExpenseNonoperatingNet
Other expense, net | (167)us-gaap_OtherNonoperatingIncomeExpense | (222)us-gaap_OtherNonoperatingIncomeExpense | (203)us-gaap_OtherNonoperatingIncomeExpense
Loss before income taxes | (39,105)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (43,330)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (88,655)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax provision | 124 us-gaap_IncomeTaxExpenseBenefit | 83 us-gaap_IncomeTaxExpenseBenefit | 611 us-gaap_IncomeTaxExpenseBenefit
Net loss | (39,229)nvtl_NetIncomeLossAttributabletoParentBeforeBeneficialConversion | (43,413)nvtl_NetIncomeLossAttributabletoParentBeforeBeneficialConversion | (89,266)nvtl_NetIncomeLossAttributabletoParentBeforeBeneficialConversion
Recognition of beneficial conversion feature | (445)nvtl_RecognitionofBeneficialConversionFeature | 0 nvtl_RecognitionofBeneficialConversionFeature | 0 nvtl_RecognitionofBeneficialConversionFeature
Net loss | $ (39,674)us-gaap_NetIncomeLoss | $ (43,413)us-gaap_NetIncomeLoss | $ (89,266)us-gaap_NetIncomeLoss
Net loss per share: |  |  |
Basic and diluted net loss per share (dollars per share) | $ (1.05)us-gaap_EarningsPerShareBasicAndDiluted | $ (1.28)us-gaap_EarningsPerShareBasicAndDiluted | $ (2.72)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average shares used in computation of basic and diluted net loss per share attributable to common shareholders: |  |  |
Weighted-average common shares outstanding (in shares) | 37,959 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 33,948 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 32,852 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted

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