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Redeemable Convertible Preferred Shares - Assumptions to Estimated Fair Value of Warrants (Detail) (USD $)
0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Mar. 05, 2014
Feb. 06, 2014
Dec. 31, 2013
Apr. 24, 2014
Dec. 31, 2014
Series E Warrants [Member]          
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]          
Dividend yield 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesEWarrantsMember
       
Series D Warrants [Member]          
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]          
Spot price   $ 4.47us-gaap_FairValueAssumptionsExercisePrice
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesDWarrantsMember
$ 4.36us-gaap_FairValueAssumptionsExercisePrice
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesDWarrantsMember
   
Risk-free interest rate   0.00%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesDWarrantsMember
0.05%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesDWarrantsMember
   
Volatility rate   0.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesDWarrantsMember
30.33%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesDWarrantsMember
   
Dividend yield   0.00%us-gaap_FairValueAssumptionsExpectedDividendRate
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesDWarrantsMember
0.00%us-gaap_FairValueAssumptionsExpectedDividendRate
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesDWarrantsMember
   
Convertible Redeemable Preferred Shares [Member] | Series E Warrants [Member]          
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]          
Risk-free interest rate 0.12%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesEWarrantsMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
       
Volatility rate 38.81%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesEWarrantsMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
       
Dividend yield 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesEWarrantsMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
       
Subscription Rights [Member]          
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]          
Risk-free interest rate 0.04%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_ClassOfWarrantOrRightAxis
= xnet_SubscriptionRightsMember
    0.02%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_ClassOfWarrantOrRightAxis
= xnet_SubscriptionRightsMember
 
Volatility rate 38.12%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_ClassOfWarrantOrRightAxis
= xnet_SubscriptionRightsMember
    42.74%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_ClassOfWarrantOrRightAxis
= xnet_SubscriptionRightsMember
 
Dividend yield 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate
/ us-gaap_ClassOfWarrantOrRightAxis
= xnet_SubscriptionRightsMember
    0.00%us-gaap_FairValueAssumptionsExpectedDividendRate
/ us-gaap_ClassOfWarrantOrRightAxis
= xnet_SubscriptionRightsMember
 
Minimum [Member]          
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]          
Volatility rate         55.36%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Minimum [Member] | Series E Warrants [Member]          
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]          
Spot price 3.31us-gaap_FairValueAssumptionsExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesEWarrantsMember
       
Risk-free interest rate 0.04%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesEWarrantsMember
       
Volatility rate 38.39%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesEWarrantsMember
       
Dividend yield 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesEWarrantsMember
       
Minimum [Member] | Convertible Redeemable Preferred Shares [Member] | Series E Warrants [Member]          
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]          
Spot price 4.50us-gaap_FairValueAssumptionsExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesEWarrantsMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
       
Dividend yield 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesEWarrantsMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
       
Minimum [Member] | Subscription Rights [Member]          
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]          
Spot price 3.31us-gaap_FairValueAssumptionsExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= xnet_SubscriptionRightsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
    3.39us-gaap_FairValueAssumptionsExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= xnet_SubscriptionRightsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Dividend yield 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate
/ us-gaap_ClassOfWarrantOrRightAxis
= xnet_SubscriptionRightsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
    0.00%us-gaap_FairValueAssumptionsExpectedDividendRate
/ us-gaap_ClassOfWarrantOrRightAxis
= xnet_SubscriptionRightsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Maximum [Member]          
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]          
Volatility rate         59.91%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Maximum [Member] | Series E Warrants [Member]          
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]          
Spot price 4.65us-gaap_FairValueAssumptionsExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesEWarrantsMember
       
Risk-free interest rate 0.12%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesEWarrantsMember
       
Volatility rate 38.81%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesEWarrantsMember
       
Dividend yield 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesEWarrantsMember
       
Maximum [Member] | Convertible Redeemable Preferred Shares [Member] | Series E Warrants [Member]          
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]          
Spot price 4.65us-gaap_FairValueAssumptionsExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesEWarrantsMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
       
Dividend yield 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementClassOfStockAxis
= xnet_SeriesEWarrantsMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
       
Maximum [Member] | Subscription Rights [Member]          
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]          
Spot price 4.65us-gaap_FairValueAssumptionsExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= xnet_SubscriptionRightsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
    4.64us-gaap_FairValueAssumptionsExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= xnet_SubscriptionRightsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Dividend yield 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate
/ us-gaap_ClassOfWarrantOrRightAxis
= xnet_SubscriptionRightsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
    0.00%us-gaap_FairValueAssumptionsExpectedDividendRate
/ us-gaap_ClassOfWarrantOrRightAxis
= xnet_SubscriptionRightsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember