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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 230us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 217us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accumulated depreciation, Property and equipment 70,051us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 68,449us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Accumulated amortization, Intangible assets $ 14,322nvtl_AcquiredIntangibleAssetsAccumulatedAmortization $ 14,050nvtl_AcquiredIntangibleAssetsAccumulatedAmortization
Preferred stock, par value $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 2,000,000us-gaap_PreferredStockSharesAuthorized 2,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, par value $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 100,000,000us-gaap_CommonStockSharesAuthorized 100,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 49,937,000us-gaap_CommonStockSharesIssued 45,742,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 49,937,000us-gaap_CommonStockSharesOutstanding 45,742,000us-gaap_CommonStockSharesOutstanding
Treasury stock, shares 0us-gaap_TreasuryStockShares 2,436,000us-gaap_TreasuryStockShares