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TAXATION - Income Tax - Applicable Tax Rates (Details)
3 Months Ended 12 Months Ended 36 Months Ended
Apr. 01, 2018
Dec. 22, 2017
Dec. 21, 2017
Dec. 31, 2022
Dec. 31, 2022
Dec. 31, 2020
Dec. 31, 2022
TAXATION              
Withholding tax rate (as a percent)         10.00%    
Withholding tax rate applicable to beneficial owner ( as a percent)         5.00%    
United States              
TAXATION              
Applicable tax rate (as a percent)   21.00% 35.00%   35.00%    
Hong Kong              
TAXATION              
Applicable tax rate (as a percent)         16.50%    
Hong Kong | Assessable profits on the first HK$2 million              
TAXATION              
Applicable tax rate (as a percent) 8.25%            
Hong Kong | Assessable profits in excess of HK$2 million              
TAXATION              
Applicable tax rate (as a percent)         16.50%    
China              
TAXATION              
Applicable tax rate (as a percent)         25.00%    
Preferential tax rate (as a percent)         15.00%    
Super deduction of research and development expenses (as a percent)         175.00%    
Pre-tax deduction ratio for R&D expenses       100.00% 75.00%    
China | Futu Network Technology (Shenzhen) Co., Ltd              
TAXATION              
Preferential tax rate (as a percent)             15.00%
Preferential tax rate, valid period         3 years 3 years  
Singapore              
TAXATION              
Applicable tax rate (as a percent)         17.00%