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TAXATION - Income Tax - Applicable Tax Rates (Details)
12 Months Ended
Dec. 21, 2017
Dec. 31, 2019
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