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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Advertising and marketing revenues      
Third parties $ 428,275 $ 207,657 $ 129,644
Total advertising and marketing revenues 570,982 402,415 264,782
Other revenues 84,818 75,476 69,390
Total revenues 655,800 477,891 334,172
Costs and Expenses      
Cost of revenues 171,231 141,960 83,599
Sales and marketing 148,283 126,059 120,361
Product development 154,088 143,444 125,832
General and administrative 41,218 28,925 26,483
Total costs and expenses 514,820 440,388 356,275
Income (loss) from operations 140,980 37,503 (22,103)
Loss from equity method investments (130) (6) (5)
Realized gain from investments 534 944 481
Investment related impairment (40,161) (8,005) (2,521)
Interest and other income, net (including interest expense on amount due to SINA of $2,838, nil, and nil for 2014, 2015 and 2016, respectively) 8,757 6,344 6,780
Change in fair value of investor option liability (Note 15)     (46,972)
Income (loss) before income tax expenses 109,980 36,780 (64,340)
Provision of income taxes 4,316 2,591 1,128
Net income (loss) 105,664 34,189 (65,468)
Less: Net loss attributable to non-controlling interests (2,363) (556) (143)
Net income (loss) attributable to Weibo 108,027 34,745 (65,325)
Other comprehensive loss      
Currency translation adjustments (net of tax of nil, nil, and nil for 2014, 2015 and 2016 respectively) (18,898) (7,874) (1,450)
Available-for-Sale securities:      
Change in unrealized loss from available-for-sale securities (net of tax of nil, nil, and nil for 2014, 2015, and 2016, respectively) (2,557) (198) (2,067)
Reclassification adjustment for net loss included in net income (loss) (net of tax of nil, nil, and nil for 2014, 2015, and 2016, respectively) 4,822    
Net change, net of tax 2,265 (198) (2,067)
Total comprehensive income (loss) 89,031 26,117 (68,985)
Less: Comprehensive loss attributable to non-controlling interests (2,637) (829) (366)
Comprehensive income (loss) attributable to Weibo $ 91,668 $ 26,946 $ (68,619)
Shares used in computing net income (loss) per share attributable to Weibo:      
Basic (in shares) 214,745 208,163 186,878
Diluted (in shares) 222,859 217,918 186,878
Income (loss) per share:      
Basic (in dollars per share) $ 0.50 $ 0.17 $ (0.35)
Diluted (in dollars per share) $ 0.48 $ 0.16 $ (0.35)
Alibaba      
Advertising and marketing revenues      
Related party $ 57,908 $ 143,650 $ 107,587
SINA and other related parties      
Advertising and marketing revenues      
Related party $ 84,799 $ 51,108 $ 27,551