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INCOME TAXES (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Contingency [Line Items]        
Gross unrecognized tax benefits, total $ 332us-gaap_UnrecognizedTaxBenefits $ 311us-gaap_UnrecognizedTaxBenefits $ 1,474us-gaap_UnrecognizedTaxBenefits $ 1,919us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits effecting income tax rate, if recognized 216us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 202us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 958us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate  
Interest income recognized from interest and penalties 28us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 71us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 13us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense  
Year during which net operating losses will begin to expire (Date) Jan. 01, 2025      
Material changes to unrecognized tax positions over the next 12 months 0us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit      
Internal Revenue Service [Member] | Earliest Tax Year [Member]        
Income Tax Contingency [Line Items]        
Years that remain open to examination (Date) 2011      
Internal Revenue Service [Member] | Latest Tax Year [Member]        
Income Tax Contingency [Line Items]        
Years that remain open to examination (Date) 2013      
State Tax Jurisdictions [Member]        
Income Tax Contingency [Line Items]        
Net operating loss carryforwards for state tax purposes 29,474us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
29,684us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
   
State Tax Jurisdictions [Member] | Earliest Tax Year [Member]        
Income Tax Contingency [Line Items]        
Years that remain open to examination (Date) 2011      
State Tax Jurisdictions [Member] | Latest Tax Year [Member]        
Income Tax Contingency [Line Items]        
Years that remain open to examination (Date) 2013      
Deferred Tax Asset Generated for Charitable Contribution [Member]        
Valuation Allowance [Line Items]        
Valuation allowance recorded   $ 800us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= ntri_DeferredTaxAssetGeneratedForCharitableContributionMember