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Investment by Alibaba (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 30, 2014 | Apr. 17, 2014 | Apr. 29, 2013 | Dec. 31, 2014
Investment by Alibaba |  |  |  |
Loss on fair value change of investor option liability |  |  |  | $ (46,972)
IPO |  |  |  |
Investment by Alibaba |  |  |  |
Amount invested in Weibo |  |  |  | 301,278
SINA |  |  |  |
Investment by Alibaba |  |  |  |
Number of shares repurchased (in shares) | 2,923,478 |  |  |
Payment for repurchase of ordinary shares | $ 42,200 |  |  |
Deemed contribution from SINA |  |  |  | 61,176
Alibaba |  |  |  |
Investment by Alibaba |  |  |  |
Amount invested in Weibo |  |  |  | 42,224
Deemed contribution from Alibaba |  |  |  | 15,300
Alibaba |  |  |  |
Investment by Alibaba |  |  |  |
Amount invested in Weibo |  |  | $ 585,800 |
Ownership interest on a fully diluted basis (as a percent) |  |  | 18.00% |
Maximum percentage of ownership interest to be reached under option granted |  | 30.00% | 30.00% |
Threshold percentage of sale of shares including prior sales considered for expiration of option to increase ownership interest |  |  | 25.00% |
Loss on fair value change of investor option liability |  |  |  | $ (47,000)
Alibaba | Class A ordinary shares |  |  |  |
Investment by Alibaba |  |  |  |
Number of ordinary shares acquired by investor (in shares) |  | 29,990,778 |  |
Percentage of discount applied on IPO offering price per share to calculate exercise price of option |  |  | 15.00% |
Threshold amount of equity valuation considered to calculate exercise price of option |  |  | $ 5,500,000 |
Alibaba | Class A ordinary shares | IPO |  |  |  |
Investment by Alibaba |  |  |  |
Number of ordinary shares acquired by investor (in shares) |  | 6,000,000 |  |
Alibaba | SINA |  |  |  |
Investment by Alibaba |  |  |  |
Number of ordinary shares acquired by investor (in shares) |  | 23,990,778 |  |
Percentage discount to IPO price applied to the shares acquired |  | 15.00% |  |
Alibaba | SINA | IPO |  |  |  |
Investment by Alibaba |  |  |  |
Percentage discount to IPO price applied to the shares acquired |  | 15.00% |  |
Alibaba | SINA | Class A ordinary shares |  |  |  |
Investment by Alibaba |  |  |  |
Number of ordinary shares acquired by investor (in shares) |  | 21,067,300 |  |
Alibaba | SINA | Class A ordinary shares | Private placement |  |  |  |
Investment by Alibaba |  |  |  |
Number of ordinary shares acquired by investor (in shares) |  | 2,923,478 |  |
Percentage of discount applied on IPO offering price per share to calculate exercise price of option |  | 15.00% |  |

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