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Nature of Business and Significant Accounting Policies - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Nature Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent Before Beneficial Conversion |  |  |  |  |  |  |  |  | $ (39,229,000)nvtl_NetIncomeLossAttributabletoParentBeforeBeneficialConversion | $ (43,413,000)nvtl_NetIncomeLossAttributabletoParentBeforeBeneficialConversion | $ (89,266,000)nvtl_NetIncomeLossAttributabletoParentBeforeBeneficialConversion
Net loss | 4,446,000 us-gaap_NetIncomeLoss | 8,832,000 us-gaap_NetIncomeLoss | 17,415,000 us-gaap_NetIncomeLoss | 8,981,000 us-gaap_NetIncomeLoss | 21,306,000 us-gaap_NetIncomeLoss | 5,093,000 us-gaap_NetIncomeLoss | 7,892,000 us-gaap_NetIncomeLoss | 9,122,000 us-gaap_NetIncomeLoss | 39,674,000 us-gaap_NetIncomeLoss | 43,413,000 us-gaap_NetIncomeLoss | 89,266,000 us-gaap_NetIncomeLoss
Cash, cash equivalents and short-term marketable securities | 17,900,000 us-gaap_CashCashEquivalentsAndShortTermInvestments |  |  |  |  |  |  |  | 17,900,000 us-gaap_CashCashEquivalentsAndShortTermInvestments |  |
Working capital | $ 29,400,000 nvtl_WorkingCapital |  |  |  |  |  |  |  | $ 29,400,000 nvtl_WorkingCapital |  |
Maturity period of cash and cash equivalents |  |  |  |  |  |  |  |  | 3 months |  |
Maturity period of marketable securities |  |  |  |  |  |  |  |  | three months |  |
Recognized income tax position (percent) |  |  |  |  |  |  |  |  | 50.00%nvtl_UncertainTaxPositionRecognitionThreshold |  |
Developed technologies |  |  |  |  |  |  |  |  |  |  |
Nature Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Period of amortization |  |  |  |  |  |  |  |  | 1 year |  |
Trade name |  |  |  |  |  |  |  |  |  |  |
Nature Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Period of amortization |  |  |  |  |  |  |  |  | 3 years |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Nature Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property and equipment useful lives |  |  |  |  |  |  |  |  | 18 months |  |
Period of warranty |  |  |  |  |  |  |  |  | 1 year |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Nature Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property and equipment useful lives |  |  |  |  |  |  |  |  | 5 years |  |
Period of warranty |  |  |  |  |  |  |  |  | 3 years |  |

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