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Redeemable Convertible Preferred Shares - Series D Convertible Redeemable Preferred Shares - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
0 Months Ended 12 Months Ended 0 Months Ended 2 Months Ended 0 Months Ended
Jan. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 24, 2014
Apr. 30, 2014
Feb. 06, 2014
Mar. 05, 2014
Mar. 31, 2014
Mar. 01, 2014
Conversion of Stock [Line Items]                    
Total consideration from issuance of Series D preferred shares and warrants $ 37,500us-gaap_ProceedsFromIssuanceOrSaleOfEquity                  
Loss on exchange of warrants   405xnet_GainLossOnSettlementInExchangeOfPreferredStockWarrants                
Retained earnings   574us-gaap_RetainedEarningsAccumulatedDeficit 7,037us-gaap_RetainedEarningsAccumulatedDeficit              
Date of completion of IPO   Jun. 24, 2014                
Fair value of warrants   (8,054)us-gaap_FairValueAdjustmentOfWarrants (1,531)us-gaap_FairValueAdjustmentOfWarrants 710us-gaap_FairValueAdjustmentOfWarrants            
Fair value of gain recognized in other income   2,922us-gaap_FairValueOptionChangesInFairValueGainLoss1                
Minimum [Member]                    
Conversion of Stock [Line Items]                    
Volatility rate   55.36%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
               
Maximum [Member]                    
Conversion of Stock [Line Items]                    
Volatility rate   59.91%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
               
Series D Preferred Stock [Member]                    
Conversion of Stock [Line Items]                    
Warrants to purchase preferred shares             1,952,663us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
    266,272us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
Warrants to purchase preferred per shares             3.38us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
    $ 3.38us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
Conversion, description   Upon issuance of Series E preferred shares in March and April 2014, the Company adjusted the Series D conversion price from USD3.5 to USD2.86 per share for 6,771,454 Series D preferred shares held by the Series D Investor.                
Converted into common share           8,391,850us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
       
Fair value of warrants   2,414us-gaap_FinancialLiabilitiesFairValueDisclosure
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
               
Initial conversion price           $ 3.5xnet_InitialConversionPrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
       
Adjusted conversion price           $ 2.86xnet_AdjustedConversionPrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
       
Preferred shares outstanding           6,771,454us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
       
Contingent beneficial conversion feature           0us-gaap_DebtInstrumentConvertibleBeneficialConversionFeature
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
       
Remaining shares held by investor                 3,808,943xnet_SharesHeldByInvestors
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
 
Beneficial conversion feature for preferred shares anti-diluted   4,008xnet_BeneficialConversionFeatureForAntidilutionAdjustment
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
               
Number of shares redeemed under rights   6,771,454us-gaap_StockRedeemedOrCalledDuringPeriodShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
               
Retained earnings   279us-gaap_RetainedEarningsAccumulatedDeficit
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
               
Exercise price of warrants         $ 0invest_InvestmentWarrantsExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
         
Series D Preferred Stock [Member] | Initial Public Offering [Member]                    
Conversion of Stock [Line Items]                    
Converted into common share   10,581,726us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
               
Initial conversion price         $ 2.86xnet_InitialConversionPrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
         
Adjusted conversion price         $ 2.27xnet_AdjustedConversionPrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
         
Preferred shares outstanding   6,771,454us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
               
Series D Preferred Stock [Member] | Minimum [Member]                    
Conversion of Stock [Line Items]                    
Volatility rate   38.39%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
               
Series D Preferred Stock [Member] | Maximum [Member]                    
Conversion of Stock [Line Items]                    
Volatility rate   43.40%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
               
Series D Warrants [Member]                    
Conversion of Stock [Line Items]                    
Warrants, exercisable period description   The holder of Series D warrants had the right to exercise the warrants at the earlier of (i) 24 months from date of Initial Closing or (ii) automatically exercised immediately prior to the closing of the following transactions (a) mergers or consolidation of the Company, b) initial public offering, c) transaction in which in excess of 50% of the Company's equity is transferred to any person, d) sale, transfer, lease, assignment conveyance, exchange, mortgage, or other disposition of all or substantially all of the assets of the Company.                
Initial fair value of warrants   3,007xnet_WarrantIssuedAtFairValue
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesDWarrantsMember
               
Fair value of warrants     2,186us-gaap_FinancialLiabilitiesFairValueDisclosure
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesDWarrantsMember
             
Fair value of (loss)/gain of warrants     1,531xnet_GainLossOnFairValueOfWarrantLiability
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesDWarrantsMember
710xnet_GainLossOnFairValueOfWarrantLiability
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesDWarrantsMember
           
Volatility rate     30.33%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesDWarrantsMember
      0.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesDWarrantsMember
     
Series E Preferred Shares [Member]                    
Conversion of Stock [Line Items]                    
Warrants to purchase preferred shares               3,406,824us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
   
Warrants to purchase preferred per shares               2.82us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
   
Converted into common share   129,166,667us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
               
Initial fair value of warrants   2,819xnet_WarrantIssuedAtFairValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
               
Initial conversion price         $ 2.82xnet_InitialConversionPrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
         
Adjusted conversion price         $ 2.4xnet_AdjustedConversionPrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
         
Remaining shares held by investor         110,014,440xnet_SharesHeldByInvestors
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
         
Fair value of warrants         6,381us-gaap_FairValueAdjustmentOfWarrants
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
         
Series E Warrants [Member]                    
Conversion of Stock [Line Items]                    
Initial fair value of warrants   6,477xnet_WarrantIssuedAtFairValue
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesEWarrantsMember
               
Fair value of warrants                     
Series E Warrants [Member] | Minimum [Member]                    
Conversion of Stock [Line Items]                    
Volatility rate               38.39%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesEWarrantsMember
   
Series E Warrants [Member] | Maximum [Member]                    
Conversion of Stock [Line Items]                    
Volatility rate               38.81%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesEWarrantsMember
   
Convertible Redeemable Preferred Shares [Member] | Series D Preferred Stock [Member]                    
Conversion of Stock [Line Items]                    
Preferred stock, issued 10,580,397us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
                 
Preferred stock, price per share $ 3.544us-gaap_SharesIssuedPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
                 
Warrants to purchase preferred shares 2,218,935us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
                 
Warrants to purchase preferred per shares $ 3.38us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
                 
Number of shares issued from existing shareholders to third-party investors 5,036,367xnet_NumberOfSharesIssuedFromExistingShareholdersToThirdPartyInvestors
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
                 
Conversion, description   Each share of the Series D preferred shares was convertible at the option of the holder, at any time after the issuance of such shares, and each share can be converted into one common share of the Company.                
Converted into common share   1us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
               
Preferred shares, redemption rights   The Series D preferred shares were redeemable at any time after the 4th anniversary of the initial closing of February 6, 2012 to request the Company to purchase all Series D preferred shares and shares issuable upon the conversion or exercise of the Series D warrants if an initial public offering is not consummated. This redemption right expires after the 5th anniversary of the initial closing of the transaction. The redemption price shall be equal to the aggregate amount of price paid at USD3.544, plus all declared but unpaid dividends up to the date of redemption plus interest of 8% per annum compounded annually from the closing of the Series D preferred shares investment(“Initial Closing”) up to and including the date of redemption.                
Preferred shares redemption price per share, minimum   $ 3.544us-gaap_TemporaryEquityRedemptionPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
               
Compound interest rate per annum on unpaid dividends   8.00%xnet_InterestRateOnUnpaidDistributionDividend
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
               
Preferred shares, carrying value   32,481us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
               
Capitalized expense   $ 2,012xnet_CapitalizationOfStockBasedCompensationExpense
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
               
Convertible Redeemable Preferred Shares [Member] | Series E Preferred Shares [Member]                    
Conversion of Stock [Line Items]                    
Converted into common share   1us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
               
Convertible Redeemable Preferred Shares [Member] | Series E Warrants [Member]                    
Conversion of Stock [Line Items]                    
Volatility rate               38.81%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesEWarrantsMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember