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Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Anti-dilutive share      
Number of preferred shares included in the calculation of diluted net income (loss) per share 0 0 0
Numerator:      
Net income (loss) attributable to Weibo $ 108,027 $ 34,745 $ (65,325)
Denominator:      
Weighted average ordinary shares outstanding (in shares) 214,745,000 208,163,000 186,878,000
Basic net income (loss) per share attributable to Weibo (in dollars per share) $ 0.50 $ 0.17 $ (0.35)
Numerator:      
Net income (loss) attributable for calculating diluted net loss per share $ 108,027 $ 34,745 $ (65,325)
Denominator:      
Weighted average ordinary shares outstanding (in shares) 214,745,000 208,163,000 186,878,000
Weighted average ordinary shares equivalents:      
Effects of dilutive securities (in shares) 8,100,000 9,800,000  
Shares used in computing diluted net income (loss) per share attributable to Weibo (in shares) 222,859,000 217,918,000 186,878,000
Diluted net income (loss) per share attributable to Weibo (in dollars per share) $ 0.48 $ 0.16 $ (0.35)
Stock options      
Weighted average ordinary shares equivalents:      
Effects of dilutive securities (in shares) 4,334,000 8,572,000  
Restricted share units      
Weighted average ordinary shares equivalents:      
Effects of dilutive securities (in shares) 3,780,000 1,183,000  
Options and RSUs      
Anti-dilutive share      
Anti-dilutive share excluded from the calculation of diluted net income (loss) per share     17,800,000