Document and Entity Information
12 Months Ended
Dec. 31, 2018
Document and Entity Information [Abstract]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2018
Document Fiscal Year Focus 2018
Document Fiscal Period Focus FY
Entity Registrant Name Xunlei Ltd
Entity Central Index Key 0001510593
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Filer Category Accelerated Filer
Trading Symbol XNET
Entity Common Stock, Shares Outstanding 336,522,780
Entity Shell Company false
Entity Emerging Growth Company true
Entity Ex Transition Period true