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Short-Term Investments - Schedule of Short-Term Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Schedule of Investments [Line Items]    
Short-term investments $ 29,427us-gaap_ShortTermInvestments $ 40,993us-gaap_ShortTermInvestments
Time deposits [Member]    
Schedule of Investments [Line Items]    
Short-term investments   9,695us-gaap_ShortTermInvestments
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_BankTimeDepositsMember
Investments in financial instruments [Member]    
Schedule of Investments [Line Items]    
Short-term investments $ 29,427us-gaap_ShortTermInvestments
/ us-gaap_InvestmentTypeAxis
= xnet_FinancialInstrumentsMember
$ 31,298us-gaap_ShortTermInvestments
/ us-gaap_InvestmentTypeAxis
= xnet_FinancialInstrumentsMember