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Income Taxes (Details)
$ / shares in Units, $ in Millions, ¥ in Billions
 1 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2025
USD ($)
jurisdiction
$ / shares
Dec. 31, 2024
USD ($)
$ / shares
Dec. 31, 2023
USD ($)
$ / shares
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
HKD ($)
Dec. 31, 2018
HKD ($)
Dec. 31, 2025
CNY (¥)
Dec. 31, 2024
CNY (¥)
Income taxes                      
Number of taxable jurisdictions | jurisdiction   2                  
Income tax rate (as a percent)   25.00% 25.00% 25.00%              
Percentage research and development expenses 200.00% 150.00%         175.00% 175.00% 175.00%    
Total income tax expenses   $ 144,521,000 $ 110,550,000 $ 145,287,000              
Valuation allowance on deferred tax assets   154,000,000 147,700,000                
Interest and penalties related to uncertain tax positions   $ 0 0                
State Administration of Taxation, China                      
Income taxes                      
Income tax rate (as a percent)   25.00%                  
Non-China                      
Income taxes                      
Withholding tax in connection with the dividends paid and to be paid   $ 41,900,000 22,100,000 43,700,000              
Total income tax expenses   $ 43,867,000 $ 22,671,000 $ 45,441,000              
Cayman Islands                      
Income taxes                      
Withholding income tax on dividends distributed by subsidiaries to its immediate holding entity outside China (as a percent)   0.00%                  
Hong Kong                      
Income taxes                      
Withholding income tax on dividends distributed by subsidiaries to its immediate holding entity outside China (as a percent)   0.00%                  
Income tax rate (as a percent)   16.50% 16.50% 16.50% 16.50% 16.50% 16.50% 16.50% 16.50%    
Withholding profits earned               $ 2 $ 2    
Withholding income tax rate for dividend paid to foreign tax resident investors (as a percentage)               8.25% 8.25%    
China                      
Income taxes                      
Withholding income tax on dividends distributed by subsidiaries to its immediate holding entity outside China (as a percent)   10.00%                  
Income tax rate (as a percent)   25.00%                  
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%               25.00%  
Percentage of withholding income tax on dividends distributed by PRC subsidiaries to its immediate holding company in Hong Kong   5.00%                  
Total income tax expenses   $ 100,654,000 $ 87,879,000 $ 99,846,000              
China | High and New Technology Enterprises                      
Income taxes                      
Preferential tax rate   15.00% 15.00% 15.00%              
Weibo Technology                      
Income taxes                      
Preferential tax treatment recognized   $ 37,000,000 $ 46,300,000 $ 48,000,000              
Effect of tax exemption and preferential tax on basic net income per share (USD per share) | $ / shares   $ 0.15 $ 0.2 $ 0.2              
Weibo Technology | Weibo HK                      
Income taxes                      
Accrued additional withholding tax on retained earnings   $ 41,900,000 $ 22,100,000 $ 43,700,000              
Proceeds from dividends received     401,600,000 406,100,000              
Withholding tax In connection with dividends received     20,100,000 20,500,000              
Total undistributed PRC earnings | ¥                   ¥ 17.7 ¥ 20.3
Weibo Technology | Research and development                      
Income taxes                      
Total income tax expenses   (18,200,000) (22,300,000) (22,200,000)              
Weibo Technology | High and New Technology Enterprises                      
Income taxes                      
Effect of preferential tax treatment   30,900,000 38,000,000 $ 42,200,000              
Weibo HK                      
Income taxes                      
Total income tax expenses   $ 43,600,000 $ 22,100,000