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Certain risks and concentration - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2019 USD ($) customer | Dec. 31, 2018 USD ($) | Dec. 31, 2017
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 | $ (166,973,000) | $ (113,804,000) |
Number of top customers accounted for net revenues | customer | 10 |  |
Intercompany balance included in accounts payable | $ 19,875,000 | 25,703,000 |
Accrued Liabilities and Other Liabilities, Inter-companies Balance | 152,904,000 | 118,259,000 |
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries | $ 245,918,000 | $ 144,433,000 |
Sales Revenue, Net [Member] | Customer concentration risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of net revenues accounted from customers | 31.00% | 23.00% | 27.00%
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Retained earnings and distributable reserves | $ 119,097,000 | $ 67,747,000 |
Shenzhen Xunlei |  |  |
Concentration Risk [Line Items] |  |  |
Term of operating contract | 10 years |  |

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