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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Accounts receivable, net of allowance for doubtful accounts $ 217us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 2,449us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Intangible assets, net of accumulated amortization $ 14,050nvtl_AcquiredIntangibleAssetsAccumulatedAmortization $ 12,983nvtl_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 shares issued at 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 45,742,000us-gaap_CommonStockSharesIssued 34,097,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 45,742,000us-gaap_CommonStockSharesOutstanding 34,097,000us-gaap_CommonStockSharesOutstanding
Treasury stock, shares 2,436,000us-gaap_TreasuryStockShares 2,436,000us-gaap_TreasuryStockShares