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Additional Information-Condensed Financial Statements of Weibo Corporation - Statements of Cash flow (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statements of Cash flow      
Net cash provided by (used in) operating activities $ 236,244 $ 181,971 $ (19,412)
Purchase of short-term investments (314,363) (149,374) (230,161)
Maturity of short-term investments 373,805 216,615 321,208
Investments and prepayments on equity investments (155,122) (268,758) (54,383)
Net cash provided by (used in) investing activities (96,745) (228,310) 13,917
Proceeds from IPO, net of commission     306,491
Repayment of amount due to SINA   (2,863) (269,042)
Proceeds from employee options exercised 4,183 7,822 1,508
Net cash provided by financing activities 3,035 4,959 43,663
Cash and cash equivalents at the beginning of the year 237,440 284,865 249,099
Cash and cash equivalents at the end of the year 364,766 237,440 284,865
Weibo Corporation      
Statements of Cash flow      
Net cash provided by (used in) operating activities 1,025 5,317 (627)
Purchase of short-term investments (30,046) (148,863) (230,161)
Maturity of short-term investments 97,798 218,762 321,208
Investments and prepayments on equity investments (120,000) (247,200) (15,096)
Investment in subsidiaries (6,535) (4,978) (68,873)
Net cash provided by (used in) investing activities (58,783) (182,279) 7,078
Proceeds from IPO, net of commission     301,270
Repayment of amount due to SINA     (255,688)
Proceeds from employee options exercised 4,183 7,822 1,508
Others     (6,462)
Net cash provided by financing activities 4,183 7,822 40,628
Net increase (decrease) in cash and cash equivalents (53,575) (169,140) 47,079
Cash and cash equivalents at the beginning of the year 60,810 229,950 182,871
Cash and cash equivalents at the end of the year 7,235 60,810 229,950
Supplemental schedule of non-cash investing and financing activities      
Investment in subsidiaries and VIE directly financed by SINA $ 18,277 $ 17,582 $ 6,413