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Taxation - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Giganology Shenzhen and Xunlei Computer [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Withholding taxes on dividends paid |  | $ 10 |  |
PRC Enterprise [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Effective income tax rate |  | 25.00% |  |
Jiangxi Node |  |  |  |
Income Tax [Line Items] |  |  |  |
Preferential tax rate (as a percent) | 15.00% | 15.00% | 15.00% |
Qianhai Shenzhen Hongkong Modern Service Industry Cooperation Zoon |  |  |  |
Income Tax [Line Items] |  |  |  |
Preferential tax rate (as a percent) |  | 15.00% | 15.00% | 15.00%
High And New Technology Enterprises [Member] | Shenzhen Xunlei, Onething, Wangwenhua and Xunlei Computer |  |  |  |
Income Tax [Line Items] |  |  |  |
Preferential tax rate (as a percent) |  | 15.00% | 15.00% | 15.00%
State Administration of Taxation, China [Member] | Research And Development Enterprise Activities [Member] | Shenzhen Xunlei [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Portion of research and development expenses incurred that are allowable as tax deductible expenses (as a percent) |  | 175.00% |  |
Domestic Tax Authority [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Withholding tax rate on foreign enterprises |  | 10.00% |  |
Withholding tax accrued or required to be accrued |  | $ 0 | $ 0 | $ 0
Domestic Tax Authority [Member] | High And New Technology Enterprises [Member] | PRC Enterprise [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Preferential tax rate (as a percent) |  | 15.00% |  |
Domestic Tax Authority [Member] | Software Enterprise [Member] | PRC Enterprise [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Period of full exemption from income tax |  | 2 years |  |
Period of 50% reduction to income tax rate |  | 3 years |  |
Domestic Tax Authority [Member] | National Key Software Enterprise [Member] | PRC Enterprise [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Preferential tax rate (as a percent) |  | 10.00% |  |
Foreign Tax Authority [Member] | British Virgin Islands |  |  |  |
Income Tax [Line Items] |  |  |  |
Withholding taxes on dividends paid |  | $ 0 |  |
Foreign Tax Authority [Member] | Hong Kong Subsidiaries |  |  |  |
Income Tax [Line Items] |  |  |  |
Income tax rate |  | 16.50% |  |
Foreign Tax Authority [Member] | Singapore Subsidiaries |  |  |  |
Income Tax [Line Items] |  |  |  |
Income tax rate |  | 17.00% |  |
Foreign Tax Authority [Member] | Cayman Islands Tax Information Authority [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Withholding taxes on dividends paid |  | $ 0 |  |

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