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Taxation - Summary of Aggregate Amount and Per Share Effect of Tax Holiday (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Aggregate dollar effect | $ (4,102) | $ (1,430) | $ (830)
Per share effect—basic | $ (0.01) | $ 0 | $ 0
Per share effect—diluted | $ (0.01) | $ 0 | $ 0

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- Definition The amount of income taxes from which a reporting entity is exempt or for which it will receive a reduction in income taxes as a result of the income tax holiday granted by the taxing jurisdiction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 11.C) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330215-122817 + Details
Name: | us-gaap_IncomeTaxHolidayAggregateDollarAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Income Tax Holiday, Income Tax Benefits Per Share Basic + References No definition available. + Details
Name: | xnet_IncomeTaxHolidayIncomeTaxBenefitsPerShareBasic
Namespace Prefix: | xnet_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Income Tax Holiday, Income Tax Benefits Per Share Diluted + References No definition available. + Details
Name: | xnet_IncomeTaxHolidayIncomeTaxBenefitsPerShareDiluted
Namespace Prefix: | xnet_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration