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Certain risks and concentration - Schedule of Consolidated Financial Information of VIEs and VIE's Subsidiaries - Income Statement (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net revenues $ 238,782 $ 186,371 $ 180,665
Cost of revenues (118,603) (92,637) (99,913)
Operating expenses (124,502) (112,527) (137,174)
Net (loss)/income attributable to Xunlei Limited 1,191 (13,840) (53,169)
Variable Interest Entity, Primary Beneficiary [Member]      
Net (loss)/income attributable to Xunlei Limited 2,913 (10,673) (56,328)
Variable Interest Entity, Primary Beneficiary [Member] | Third-party      
Net revenues 228,736 186,679 178,070
Cost of revenues (109,722) (92,388) (99,781)
Operating expenses (110,367) (101,421) (117,714)
Variable Interest Entity, Primary Beneficiary [Member] | Inter-company      
Operating expenses $ (8,032) $ (7,177) $ (7,302)