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Income Taxes - Reconciliation of Effective Tax Rate and the Federal Statutory Tax Rate (Detail)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Federal Statutory Tax Rate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State Income Taxes, net of Federal Income Tax Benefit 3.37%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 1.77%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Non-deductible expenses 5.89%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 1.89%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
Non-deductible stock options and warrants 4.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost 14.45%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
Non-deductible tax expense 8.79%neo_EffectiveIncomeTaxRateReconciliationNondeductibleTaxExpense  
Prior year adjustments for stock compensation (27.93%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes  
Other, net   0.26%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Valuation allowance (15.96%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (45.44%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Effective Tax Rate 12.16%us-gaap_EffectiveIncomeTaxRateContinuingOperations 6.93%us-gaap_EffectiveIncomeTaxRateContinuingOperations