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Additional information: condensed financial statements of the Company - Schedule of Condensed Statement of Cash Flows (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from financing activities |  |  |
Net (decrease)/increase in cash, cash equivalents and restricted cash | $ (31,988) | $ 45,788 | $ (104,036)
Cash, cash equivalents, and restricted cash at beginning of year | 165,448 | 122,930 | 233,479
Effect of exchange rates on cash and cash equivalents, and restricted cash | 5,329 | (3,270) | (6,513)
Cash, cash equivalents, and restricted cash at end of year | 138,789 | 165,448 | 122,930
Xunlei Limited [Member] |  |  |
Cash flows from operating activities |  |  |
Net cash used in operating activities | (12,704) | (171,796) | (88,309)
Cash flows from investing activities |  |  |
Net cash generated from investing activities | 12,051 | 52,359 | 37,788
Cash flows from financing activities |  |  |
Net cash used in financing activities | (4,475) |  |
Net (decrease)/increase in cash, cash equivalents and restricted cash | (5,128) | (119,437) | (50,521)
Cash, cash equivalents, and restricted cash at beginning of year | 110,238 | 229,675 | 280,196
Effect of exchange rates on cash and cash equivalents, and restricted cash | 0 | 0 | 0
Cash, cash equivalents, and restricted cash at end of year | $ 105,110 | $ 110,238 | $ 229,675

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