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Income Taxes (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	Feb. 22, 2008	Dec. 31, 2016 USD ($) jurisdiction $ / shares	Dec. 31, 2015 USD ($) $ / shares	Dec. 31, 2014 USD ($)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Income taxes
Number of taxable jurisdictions | jurisdiction		2
Components of loss before income taxes
Income (Loss) before income tax expenses		$ 109,980	$ 36,780	$ (64,340)
Loss from non-China operations		(60,193)	(28,016)	(54,073)
Income (Loss) from China operations		170,173	64,796	(10,267)
Income tax expense applicable to China operations		$ 4,316	$ 2,591	$ 1,128
Effective tax rate for China operations (as a percent)		2.50%	4.00%	(11.00%)
Loss from the change in fair value of investor option liability				$ 46,972
Loss from investment impairments		$ (31,586)	$ (6,608)	$ (2,521)
Income tax rate (as a percent)		25.00%	25.00%	25.00%
Net operating loss carry forwards		$ 129,300	$ 160,500
Composition of income tax expenses for China operations
Deferred tax expenses (benefits)		(4,630)	(977)	$ 866
Current income tax expenses		8,946	3,568	262
Income tax expenses		$ 4,316	$ 2,591	$ 1,128
Reconciliation of the statutory tax rate to the effective tax rate for China operations
Statutory EIT rate (as a percent)		25.00%	25.00%	25.00%
Effect on tax holiday (as a percent)		(29.60%)	(24.20%)
Permanent differences (as a percent)		1.20%	0.50%	2.20%
Change in valuation allowance (as a percent)		5.90%	2.70%	(38.20%)
Effective tax rate for China operations (as a percent)		2.50%	4.00%	(11.00%)
Deferred tax assets:
Net operating loss carry forwards		$ 32,158	$ 41,604
Less: valuation allowance		(32,158)	(41,604)
Depreciation, accounts receivable, accrued and other liabilities		13,957	4,550
Less: valuation allowance		(8,576)	(3,057)
Net deferred tax assets		5,381	1,493
Valuation allowance on deferred tax assets		40,700	44,700
Deferred tax liabilities:
Acquired intangible assets		274	477
Depreciation		362	295
Others		181	566
Total deferred tax liabilities		$ 817	1,338
Historical rate for valuing deferred tax assets (as a percent)		25.00%
Weibo Technology
Reconciliation of the statutory tax rate to the effective tax rate for China operations
Effect of tax exemption		$ 50,400	$ 15,700
Effect of tax exemption on basic net income per share (USD per share) | $ / shares		$ 0.23	$ 0.08
Non- China
Components of loss before income taxes
Loss from the change in fair value of investor option liability				$ 47,000
Loss from investment impairments		$ 23,800
Cayman Islands
Components of loss before income taxes
Withholding income tax on dividends distributed by subsidiaries to its immediate holding entity outside China (as a percent)		0.00%
Hong Kong
Components of loss before income taxes
Income tax rate (as a percent)		16.50%	16.50%	16.50%
Net operating loss carry forwards		$ 1,400
Reconciliation of the statutory tax rate to the effective tax rate for China operations
Statutory EIT rate (as a percent)		16.50%	16.50%	16.50%
China
Components of loss before income taxes
Income tax rate (as a percent)		25.00%	25.00%	25.00%	25.00%	25.00%	25.00%	25.00%	25.00%	25.00%
Withholding income tax on dividends distributed by subsidiaries to its immediate holding entity outside China (as a percent)		10.00%
Maximum percentage of withholding income tax on dividends distributed by subsidiaries to its immediate holding entity in Hong Kong		5.00%
Percentage of ownership interests held by foreign investors		25.00%
Percentage of withholding income tax on dividends distributed by PRC subsidiaries to its immediate holding company in Hong Kong		5.00%
Reconciliation of the statutory tax rate to the effective tax rate for China operations
Statutory EIT rate (as a percent)		25.00%	25.00%	25.00%	25.00%	25.00%	25.00%	25.00%	25.00%	25.00%
China | Software enterprise
Components of loss before income taxes
Period of income tax exemption	2 years
Reduction in preferential tax rate (as a percent)	50.00%
Preferential statutory rate (as a percent)	12.50%
Period of reduced preferential income tax rate	3 years

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The amount of income taxes from which a reporting entity is exempt or for which it will receive a reduction in income taxes as a result of the income tax holiday granted by the taxing jurisdiction.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Per share amount effect of the income tax benefit resulting from the income tax holidays granted by taxing jurisdictions.

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- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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-Name Accounting Standards Codification
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- Definition

The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Represents the previous statutory tax rate historically used to value deferred tax assets.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from depreciation, accounts receivables, accrued and other liabilities.

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The amount as of the balance sheet date of the estimated future tax effects attributable to the difference between the tax basis of depreciation computed in accordance with generally accepted accounting principles.

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- Definition

The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from depreciation, accounts receivables, accrued and other liabilities for which it is more likely than not that a tax benefit will not be realized.

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- Definition

The portion of the difference between the effective income tax rate and the domestic federal statutory income tax rate attributable to permanent differences.

+ References

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- Definition

The minimum direct ownership percentage in the foreign invested enterprises owned by the foreign investor, determining whether the lower withholding income tax rate can be applied for dividends distributed by the foreign invested enterprise to its immediate holding entity in Hong Kong.

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No definition available.

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- Definition

Represents number of tax jurisdictions where the entity operated its business.

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- Definition

Represents the preferential statutory rate granted to some entities under the income tax law.

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No definition available.

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- Definition

Represents the period of tax holiday granted under income tax law.

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- Definition

Represents the percentage reduction in preferential income tax rate during the three years following the special tax holiday period.

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Represents the period for which reduced preferential income tax rate is granted under income tax law.

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- Definition

Represents the maximum percentage of withholding income tax on dividends distributed by wholly foreign-owned enterprises (WFOEs) to its immediate holding entity in Hong Kong.

+ References

No definition available.

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- Definition

Represents the withholding income tax on dividends, imposed under the income law, on dividends distributed by wholly foreign-owned enterprises (WFOEs) to its immediate holding entity outside of China, if such immediate holding entity is considered as a non-resident enterprise.

+ References

No definition available.

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- Definition

Represents the percentage of withholding income tax on dividends distributed by PRC subsidiaries to its immediate holding company in Hong Kong, which is deemed as non-resident enterprise.

+ References

No definition available.

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