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Basic and Diluted Net income / (loss) Per Share (Schedule of Basic and Diluted Net income / (loss) Per Share) (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Numerator: |  |  |
Net loss from continuing operations | $ (44,216) | $ (30,806) | $ (18,567)
Net loss from discontinued operations | 6,407 | 6,623 | 4,101
Net loss | (37,809) | (24,183) | (14,466)
Less: Net income/(loss) attributable to the non-controlling interest | 13 | (72) | (1,299)
Net loss attributable to Xunlei Limited | (37,822) | (24,111) | (13,167)
Net loss attributable to Xunlei Limited’s common shareholders | (37,822) | (24,111) | (13,167)
Numerator of basic net loss per share from continuing operations | (44,229) | (30,734) | (17,268)
Numerator of basic net income per share from discontinued operations | 6,407 | 6,623 | 4,101
Numerator for diluted loss per share from continuing operations | (44,229) | (30,734) | (17,268)
Numerator for diluted loss per share from discontinued operations | $ 6,407 | $ 6,623 | $ 4,101
Denominator: |  |  |
Denominator for basic net loss per share-weighted average shares outstanding | 331,731,963 | 334,155,668 | 335,987,595
Denominator for diluted net loss per share | 331,731,963 | 334,155,668 | 335,987,595
Basic net loss per share from continuing operations | $ (0.1333) | $ (0.0919) | $ (0.0514)
Basic net loss per share from discontinued operations | 0.0193 | 0.0198 | 0.0122
Diluted net loss per share from continuing operations | (0.1333) | (0.0919) | (0.0514)
Diluted net loss per share from discontinued operations | $ 0.0193 | $ 0.0198 | $ 0.0122

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