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Income Taxes (Details 1) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Deferred tax assets:      
Stock-based compensation $ 5,942,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits $ 5,371,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits  
Tax credits 3,162,000us-gaap_TaxCreditCarryforwardAmount 2,895,000us-gaap_TaxCreditCarryforwardAmount  
Deferred revenue 575,000us-gaap_DeferredFinanceCostsNet 861,000us-gaap_DeferredFinanceCostsNet  
Start-up and organizational costs 276,000nuot_StartupAndOrganizationalCosts 272,000nuot_StartupAndOrganizationalCosts  
Tax deductible Goodwill 88,000nuot_DeferredTaxAssetsTaxDeductibleGoodwill 112,000nuot_DeferredTaxAssetsTaxDeductibleGoodwill  
Property and equipment 56,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 240,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment  
Other 389,000us-gaap_DeferredTaxAssetsOther 153,000us-gaap_DeferredTaxAssetsOther  
Total deferred tax assets 10,488,000us-gaap_DeferredTaxAssetsGross 9,904,000us-gaap_DeferredTaxAssetsGross  
Deferred tax liabilities:      
Intangible Assets (10,325,000)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (12,219,000)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets  
Discount on Note Payable (13,825,000)us-gaap_DeferredTaxLiabilitiesDeferredExpense (1,088,000)us-gaap_DeferredTaxLiabilitiesDeferredExpense  
Other (89,000)us-gaap_DeferredTaxLiabilitiesOther (69,000)us-gaap_DeferredTaxLiabilitiesOther  
Total deferred tax liabilities (24,239,000)us-gaap_DeferredIncomeTaxLiabilities (13,376,000)us-gaap_DeferredIncomeTaxLiabilities  
Net deferred tax assets, excluding net operating loss carryforwards (13,751,000)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent (3,472,000)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent  
Net operating loss carryforwards 53,222,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 45,458,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Deferred Tax Assets, Gross, Noncurrent 39,471,000us-gaap_DeferredTaxAssetsGrossNoncurrent 41,986,000us-gaap_DeferredTaxAssetsGrossNoncurrent  
Less valuation allowance (39,559,000)us-gaap_DeferredTaxAssetsValuationAllowance (42,055,000)us-gaap_DeferredTaxAssetsValuationAllowance (38,406,000)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets (liabilities) $ (88,000)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (69,000)us-gaap_DeferredTaxAssetsLiabilitiesNet