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TAXATION - Income Tax - Applicable Tax Rates (Details)
12 Months Ended 24 Months Ended
Dec. 21, 2017
Dec. 31, 2020
Dec. 31, 2020
TAXATION      
Withholding tax rate (as a percent)   10.00%  
Withholding tax rate applicable to beneficial owner ( as a percent)   5.00%  
The United States ("US")      
TAXATION      
Applicable tax rate (as a percent) 35.00% 21.00%  
Hong Kong      
TAXATION      
Applicable tax rate (as a percent)   16.50%  
China      
TAXATION      
Preferential tax rate (as a percent)   15.00%  
Super deduction of research and development expenses (as a percent)   175.00%  
Applicable tax rate (as a percent)   25.00%  
China | Futu Network Technology (Shenzhen) Co., Ltd      
TAXATION      
Preferential tax rate (as a percent)     15.00%
Preferential tax rate, valid period   3 years