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v2.4.1.9

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

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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