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Related Party Transactions - Schedule of Significant Related Party Transactions (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Other Related Party Transactions [Line Items]      
Advance to related party $ 22us-gaap_DueFromRelatedPartiesCurrent $ 85us-gaap_DueFromRelatedPartiesCurrent  
Advertisement revenue 38,378us-gaap_AdvertisingRevenue 48,028us-gaap_AdvertisingRevenue 61,795us-gaap_AdvertisingRevenue
Zhuhai Qianyou [Member]      
Schedule of Other Related Party Transactions [Line Items]      
Game sharing costs paid and payable to Zhuhai Qianyou 402us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= xnet_ZhuhaiQianyouMember
1,760us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= xnet_ZhuhaiQianyouMember
1,041us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= xnet_ZhuhaiQianyouMember
Hao Cheng [Member]      
Schedule of Other Related Party Transactions [Line Items]      
Advance to related party   85us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= xnet_HaoChengMember
 
Repayment from related party 85xnet_ProceedsFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= xnet_HaoChengMember
   
Beijing Millet Technology Co., LTD [Member]      
Schedule of Other Related Party Transactions [Line Items]      
Advance to related party 5us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= xnet_BeijingMilletTechnologyMember
   
Technology service revenue related party 303us-gaap_TechnologyServicesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= xnet_BeijingMilletTechnologyMember
   
Advertisement revenue 871us-gaap_AdvertisingRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= xnet_BeijingMilletTechnologyMember
   
Shenglong Zou [Member]      
Schedule of Other Related Party Transactions [Line Items]      
Advance to related party 10us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= xnet_ShenglongZouMember
   
Chuan Wang [Member]      
Schedule of Other Related Party Transactions [Line Items]      
Advance to related party $ 7us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= xnet_ChuanWangMember