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Certain risks and concentration - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2020 USD ($) customer | Dec. 31, 2019 USD ($) | Dec. 31, 2018
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 | $ (181,095,000) | $ (166,973,000) |
Number of top customers accounted for net revenues | customer | 10 |  |
Intercompany balance included in accounts payable | $ 30,439,000 | 21,297,000 |
Accrued Liabilities and Other Liabilities, Inter-companies Balance | 152,611,000 | 152,904,000 |
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries | 168,493,000 |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Accounts payable, consolidated variable interest entities and VIE's subsidiaries without recourse | 20,588,000 | 23,865,000 |
Accrued liabilities and other payables, consolidated variable interest entities and VIE's subsidiaries without recourse | $ 33,361,000 | $ 38,502,000 |
Shenzhen Xunlei |  |  |
Concentration Risk [Line Items] |  |  |
Term of operating contract | 10 years |  |
Sales Revenue, Net [Member] | Customer concentration risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of net revenues accounted from customers | 38.00% | 31.00% | 23.00%

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