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Related Party Transactions (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Related party transactions
Costs and expenses allocated from SINA	$ 25,703,000	$ 24,678,000	$ 42,360,000
Interest expense on amount due to SINA	0	0	2,838,000
Repayment of amount due to SINA		2,863,000	269,042,000
Related party outstanding balance:
Due to related parties		12,188,000
SINA
Related party transactions
Revenue billed through SINA	39,285,000	22,114,000	4,057,000
Deemed contribution from SINA			61,176,000
Costs and expenses allocated from SINA	25,703,000	24,678,000	42,360,000
Interest expense on amount due to SINA			2,838,000
Repayment of amount due to SINA		2,863,000	276,614,000
Other costs and expenses billed by SINA	20,300,000	29,400,000	15,100,000
Related party outstanding balance:
Accounts receivable due from related parties	18,565,000
Due to related parties		12,188,000
SINA | Transfer of Equity Interest in Weibo Funds
Related party transactions
Legal transfer of investee and recognition of due to SINA			22,565,000
Alibaba
Related party transactions
Advertising and marketing revenues from related party	57,908,000	143,650,000	107,587,000
Deemed contribution from Alibaba			15,300,000
Services provided by Alibaba	13,988,000	4,515,000	128,000
Related party outstanding balance:
Accounts receivable due from related parties	24,293,000	54,052,000
Alibaba | Strategic cooperation with Alibaba
Related party transactions
Advertising and marketing revenues from related party		137,400,000	107,600,000
Other related parties
Related party transactions
Advertising and marketing revenues from related party	45,600,000	29,200,000	27,600,000
Related party outstanding balance:
Other revenues from related party	600,000	2,100,000	1,500,000
Amount of promotional services from related parties	10,600,000	7,800,000	$ 11,200,000
Due from related parties	30,100,000	33,900,000
Due to related parties	$ 9,300,000	$ 8,000,000

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- Definition

Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.

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The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle).

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Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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Amount of interest expense incurred on a debt or other obligation to related party.

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Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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Amount recognized as a deemed contribution due to price discount applied to the ordinary shares sold to certain investors.

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Amount of selling and marketing expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party.

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