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Financial Statement Details - Summary of Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Royalties | $ 4,035 us-gaap_AccruedRoyaltiesCurrent | $ 4,243 us-gaap_AccruedRoyaltiesCurrent |
Payroll and related expenses | 8,038 us-gaap_EmployeeRelatedLiabilitiesCurrent | 4,828 us-gaap_EmployeeRelatedLiabilitiesCurrent |
Product warranty | 1,196 us-gaap_ProductWarrantyAccrual | 2,244 us-gaap_ProductWarrantyAccrual | 2,329 us-gaap_ProductWarrantyAccrual
Market development funds and price protection | 2,502 nvtl_MarketDevelopmentFundAndPriceProtection | 3,059 nvtl_MarketDevelopmentFundAndPriceProtection |
Professional fees | 780 us-gaap_AccruedProfessionalFeesCurrent | 1,040 us-gaap_AccruedProfessionalFeesCurrent |
Deferred revenue | 962 us-gaap_DeferredRevenue | 2,999 us-gaap_DeferredRevenue |
Restructuring | 1,886 us-gaap_RestructuringReserveCurrent | 610 us-gaap_RestructuringReserveCurrent |
Other | 4,445 us-gaap_OtherAccruedLiabilitiesCurrent | 4,248 us-gaap_OtherAccruedLiabilitiesCurrent |
Accrued expenses, Total | $ 23,844 us-gaap_AccruedLiabilitiesCurrent | $ 23,271 us-gaap_AccruedLiabilitiesCurrent |

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