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TAXATION - Income Tax - Applicable Tax Rates (Details)
12 Months Ended 24 Months Ended
Apr. 01, 2018
Dec. 22, 2017
Dec. 21, 2017
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
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)   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%      
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%