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v3.21.1

Organization and nature of operations - Additional Information (Details) ¥ / shares in Units, $ in Thousands, ¥ in Millions | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 31, 2011 CNY (¥) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 ¥ / shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |  |
Number of year's power of attorney retained |  | 10 years |  |  |  |
Percentage of pre-tax operating profit |  | 80.00% |  |  |  |
Right-of-use assets | $ |  |  | $ 1,954 |  | $ 8,747 | $ 11,819
Lease liabilities | $ |  |  | $ 1,988 |  | $ 8,825 |
Giganology Shenzhen |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Termination of agreement, notice period |  | 30 days |  |  |  |
Automated extended period of agreement |  | 10 years |  |  |  |
Agreement expiration date |  | 2022 |  |  |  |
Agreement between Giganology Shenzhen and Mr. Sean Shenglong Zou [Member] |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Additional interest-free loans |  | ¥ 20 |  |  |  |
Increase in registered capital |  | 30 |  |  |  |
Agreement between Giganology Shenzhen and Shareholders of Shenzhen Xunlei [Member] |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Interest-free loans |  | ¥ 9 |  |  |  |
Agreement between Giganology Shenzhen and Shenzhen Xunlei [Member] |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Increase in registered capital | ¥ 20 |  |  |  |  |
Term agreement expiration year |  | 2016 |  |  |  |
Call Option Agreement [Member] | Giganology Shenzhen |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Agreement expiration date |  | 2022 |  |  |  |
Outstanding share, purchase price per share | ¥ / shares |  |  |  | ¥ 1 |  |
Exclusive Technology Support and Services Agreement [Member] |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Percentage of pre-tax operating profit |  | 20.00% |  |  |  |
Exclusive Technology Support and Services Agreement [Member] | Giganology Shenzhen |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Term agreement expiration year |  | 2025 |  |  |  |
Exclusive Technology Consulting and Training Agreement [Member] |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Percentage of pre-tax operating profit |  | 20.00% |  |  |  |
Software and Proprietary Technology License Contract [Member] |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Percentage of pre-tax operating profit |  | 40.00% |  |  |  |

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