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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current:      
U.S. federal $ 3,826,000us-gaap_CurrentFederalTaxExpenseBenefit $ 3,876,000us-gaap_CurrentFederalTaxExpenseBenefit $ 4,755,000us-gaap_CurrentFederalTaxExpenseBenefit
Foreign 525,000us-gaap_CurrentForeignTaxExpenseBenefit 344,000us-gaap_CurrentForeignTaxExpenseBenefit 87,000us-gaap_CurrentForeignTaxExpenseBenefit
State and local 137,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 1,061,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 1,301,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total current 4,488,000us-gaap_CurrentIncomeTaxExpenseBenefit 5,281,000us-gaap_CurrentIncomeTaxExpenseBenefit 6,143,000us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:      
U.S. federal 1,012,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit (7,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (445,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Foreign 0us-gaap_DeferredForeignIncomeTaxExpenseBenefit 2,000us-gaap_DeferredForeignIncomeTaxExpenseBenefit 0us-gaap_DeferredForeignIncomeTaxExpenseBenefit
State and local 963,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (435,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (40,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total deferred 1,975,000us-gaap_DeferredIncomeTaxExpenseBenefit (440,000)us-gaap_DeferredIncomeTaxExpenseBenefit (485,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for income taxes 6,463,000us-gaap_IncomeTaxExpenseBenefit 4,841,000us-gaap_IncomeTaxExpenseBenefit 5,658,000us-gaap_IncomeTaxExpenseBenefit
Income taxes at federal statutory rate 2,424,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 3,722,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 4,980,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit 833,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 591,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 793,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Sale of Ijie operations 1,404,000us-gaap_IncomeTaxReconciliationDispositionOfAssets 0us-gaap_IncomeTaxReconciliationDispositionOfAssets 0us-gaap_IncomeTaxReconciliationDispositionOfAssets
Foreign taxes 714,000us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (102,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (44,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Subpart F income 570,000us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings 0us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings 0us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings
Income tax reserve 266,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 690,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 0us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Nondeductible expenses 252,000us-gaap_IncomeTaxReconciliationNondeductibleExpense 352,000us-gaap_IncomeTaxReconciliationNondeductibleExpense 122,000us-gaap_IncomeTaxReconciliationNondeductibleExpense
Provision for foreign unremitted earnings 221,000xoxo_EffectiveIncomeTaxRateReconciliationProvisionforforeignunremittedearnings 0xoxo_EffectiveIncomeTaxRateReconciliationProvisionforforeignunremittedearnings 0xoxo_EffectiveIncomeTaxRateReconciliationProvisionforforeignunremittedearnings
Return to provision 51,000us-gaap_IncomeTaxReconciliationOtherReconcilingItems (423,000)us-gaap_IncomeTaxReconciliationOtherReconcilingItems 0us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Domestic production activities deduction (236,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseResearchAndDevelopment (264,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseResearchAndDevelopment (236,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseResearchAndDevelopment
Other (36,000)us-gaap_IncomeTaxReconciliationOtherAdjustments 275,000us-gaap_IncomeTaxReconciliationOtherAdjustments 43,000us-gaap_IncomeTaxReconciliationOtherAdjustments
Provision for income taxes 6,463,000us-gaap_IncomeTaxExpenseBenefit 4,841,000us-gaap_IncomeTaxExpenseBenefit 5,658,000us-gaap_IncomeTaxExpenseBenefit
Deferred tax assets:      
Net operating loss and tax credit carryforwards 12,745,000xoxo_DeferredTaxAssetsOperatingLossAndTaxCreditCarryforwards 16,387,000xoxo_DeferredTaxAssetsOperatingLossAndTaxCreditCarryforwards  
Allowance for doubtful accounts and other reserves 3,092,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 1,021,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts  
Deferred rent 2,392,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent 2,891,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent  
Stock-based compensation 1,550,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 2,974,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost  
Other 1,121,000us-gaap_DeferredTaxAssetsOther 978,000us-gaap_DeferredTaxAssetsOther  
Total deferred tax assets 20,900,000us-gaap_DeferredTaxAssetsGross 24,251,000us-gaap_DeferredTaxAssetsGross  
Deferred tax liabilities:      
Unremitted earnings (221,000)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings 0us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings  
Intangible assets (165,000)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (1,872,000)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets  
Property and equipment (2,405,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (1,867,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
Capitalized software costs (1,947,000)us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware (768,000)us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware  
Total deferred tax liabilities (4,738,000)us-gaap_DeferredIncomeTaxLiabilities (4,507,000)us-gaap_DeferredIncomeTaxLiabilities  
Total net deferred tax assets 16,162,000us-gaap_DeferredTaxAssetsLiabilitiesNet 19,744,000us-gaap_DeferredTaxAssetsLiabilitiesNet  
Net operating loss carryforwards 42,200,000us-gaap_OperatingLossCarryforwards    
Net operating loss carryforwards future taxable income offset limitation 3,600,000xoxo_OperatingLossCarryforwardsFutureNetIncomeOffsetLimitation    
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balances of unrecognized tax benefits as of January 1 5,093,000us-gaap_UnrecognizedTaxBenefits 4,403,000us-gaap_UnrecognizedTaxBenefits  
(Decreases) increases for positions taken in prior years (3,089,000)us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 426,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions  
Increases for positions related to the current year 172,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 264,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions  
Balance of unrecognized tax benefits as of December 31 2,176,000us-gaap_UnrecognizedTaxBenefits 5,093,000us-gaap_UnrecognizedTaxBenefits 4,403,000us-gaap_UnrecognizedTaxBenefits
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward Recorded in Other Long-term Liabilities 2,200,000xoxo_UnrecognizedTaxBenefitsResultinginNetOperatingLossCarryforwardRecordedinOtherLongtermLiabilities    
Income tax penalties and interest expense 30,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 200,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense  
Income tax penalties and interest accrued 100,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 100,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued  
Deferred Tax Liabilities, Other 200,000us-gaap_DeferredTaxLiabilitiesOther    
Other Noncurrent Liabilities      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward Recorded in Other Long-term Liabilities $ 900,000xoxo_UnrecognizedTaxBenefitsResultinginNetOperatingLossCarryforwardRecordedinOtherLongtermLiabilities
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