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Additional Information-Condensed Financial Statements of Weibo Corporation - Statements of Comprehensive Income (Loss) (Parenthetical) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statements of Comprehensive Income (Loss)
Currency translation adjustments, tax	$ 0	$ 0	$ 0
Change in unrealized loss from available-for-sale securities, tax	0	0	0
Reclassification adjustment for net loss included in net income (loss), tax	0	0	0
Weibo Corporation
Statements of Comprehensive Income (Loss)
Currency translation adjustments, tax	0	0	0
Change in unrealized loss from available-for-sale securities, tax	0	0	0
Reclassification adjustment for net loss included in net income (loss), tax	$ 0	$ 0	$ 0

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Amount of tax expense (benefit), before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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