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Income Taxes - Summary of Net Deferred Tax Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Accrued expenses $ 4,566us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities $ 11,292us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Inventory obsolescence provision 2,352us-gaap_DeferredTaxAssetsInventory 3,539us-gaap_DeferredTaxAssetsInventory
Depreciation and amortization 4,137us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 4,136us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Deferred rent 555us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent 559us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent
Net operating loss and tax credit carryforwards 76,346nvtl_DeferredTaxAssetsNetOperatingLossAndTaxCreditCarryforwards 55,010nvtl_DeferredTaxAssetsNetOperatingLossAndTaxCreditCarryforwards
Stock-based compensation 1,910us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 4,518us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Unrecognized tax benefits 1,296nvtl_DeferredTaxAssetsUnrecognizedTaxBenefits 1,190nvtl_DeferredTaxAssetsUnrecognizedTaxBenefits
Deferred tax assets 91,162us-gaap_DeferredTaxAssetsGross 80,244us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:    
Amortization of acquired intangibles (388)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (699)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Net deferred tax assets 90,774nvtl_DeferredTaxAssetsLiabilitiesGross 79,545nvtl_DeferredTaxAssetsLiabilitiesGross
Valuation allowance (90,774)us-gaap_DeferredTaxAssetsValuationAllowance (79,458)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet $ 87us-gaap_DeferredTaxAssetsLiabilitiesNet