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v3.20.1

Organization and nature of operations - Additional Information (Details) ¥ / shares in Units, ¥ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
May 31, 2011 CNY (¥) | Dec. 31, 2019 CNY (¥) ¥ / shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2019 USD ($) | Jan. 01, 2019 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Number of year's power of attorney retained |  | 10 years | 10 years |  |  |  |
Percentage of pre-tax operating profit |  | 80.00% | 80.00% |  |  |  |
Right-of-use assets |  |  |  | $ 11,819,000 |  | $ 8,747,000 |
Lease liabilities |  |  |  |  |  | $ 8,825 |
Giganology Shenzhen |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Termination of agreement, notice period |  | 30 days | 30 days |  |  |  |
Automated extended period of agreement |  | 10 years | 10 years |  |  |  |
Agreement expiration date |  | 2022 | 2022 |  |  |  |
Shareholder Service [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Service fees payable |  |  | $ 811,000 | $ 825,000 | $ 1,155,000 |  |
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 | 2016 |  |  |  |
Call Option Agreement [Member] | Giganology Shenzhen |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Agreement expiration date |  | 2022 | 2022 |  |  |  |
Outstanding share, purchase price per share | ¥ / shares |  | ¥ 1 |  |  |  |  |
Accounting Standards Update 2016-02 [Member] | Restatement Adjustment [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Right-of-use assets |  |  |  |  |  |  | $ 11,800,000
Lease liabilities |  |  |  |  |  |  | $ 11,400,000
Exclusive Technology Support and Services Agreement [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Percentage of pre-tax operating profit |  | 20.00% | 20.00% |  |  |  |
Exclusive Technology Support and Services Agreement [Member] | Giganology Shenzhen |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Term agreement expiration year |  | 2025 | 2025 |  |  |  |
Exclusive Technology Consulting and Training Agreement [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Percentage of pre-tax operating profit |  | 20.00% | 20.00% |  |  |  |
Software and Proprietary Technology License Contract [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Percentage of pre-tax operating profit |  | 40.00% | 40.00% |  |  |  |

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