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Certain risks and concentration - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2021 USD ($) customer | Dec. 31, 2020 USD ($) | Dec. 31, 2019
Concentration Risk [Line Items] |  |  |
Maximum foreign ownership in internet information provider or other value-added telecommunication service provider's business allowed under PRC laws and regulations | 50.00% |  |
Retained earnings and distributable reserves | $ (180,645,000) | $ (181,095,000) |
Number of top customers accounted for net revenues | customer | 10 |  |
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries | $ 169,235,000 |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Accounts payable, consolidated variable interest entities and VIE's subsidiaries without recourse | 23,789,000 | 20,588,000 |
Accrued liabilities and other payables, consolidated variable interest entities and VIE's subsidiaries without recourse | $ 42,449,000 | $ 33,361,000 |
Shenzhen Xunlei |  |  |
Concentration Risk [Line Items] |  |  |
Term of operating contract | 10 years |  |
Sales Revenue, Net [Member] | Customer concentration risk [Member] | Top 10 customers |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of net revenues accounted from customers | 35.00% | 38.00% | 31.00%

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