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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
	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

X

- 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

X

- 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

X

- 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