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Additional information: condensed financial statements of the Company - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Decrease in net cash used in operating activities | $ 19,480 | $ (13,911) | $ (45,649) |
Increase (decrease) net cash generated from investing activities | (32,619) | (20,756) | 79,260 |
Decrease in cash and cash equivalents | 127,436 | 138,789 | 165,448 | $ 122,930
Adjustment |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Decrease in net cash used in operating activities |  |  | 17,600 |
Xunlei Limited [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Increase in investments in subsidiaries and consolidated VIE | 36,324 | 20,064 |  |
Decrease in cash and cash equivalents | $ 32,015 | 57,585 | 7,683 | $ 47,781
Xunlei Limited [Member] | Adjustment |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Decrease in current portion of due from subsidiaries and consolidated VIE |  | 275,700 |  |
Increase in non-current portion of due from subsidiaries and consolidated VIE |  | 175,700 |  |
Increase in investments in subsidiaries and consolidated VIE |  | 100,000 |  |
Decrease in net cash used in operating activities |  | 13,400 | 175,700 |
Increase (decrease) net cash generated from investing activities |  | 41,700 | 96,300 |
Decrease in cash and cash equivalents |  | $ 102,600 | $ 181,900 |

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