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TAXATION - Income Tax - Applicable Tax Rates (Details)
9 Months Ended 12 Months Ended 24 Months Ended
Apr. 01, 2018
Dec. 22, 2017
Dec. 21, 2017
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
TAXATION                  
Withholding tax rate (as a percent)       10.00%   10.00%      
Withholding tax rate applicable to beneficial owner ( as a percent)       5.00%   5.00%      
The United States ("US")                  
TAXATION                  
Applicable tax rate (as a percent)   21.00% 35.00% 35.00%   35.00%      
Hong Kong                  
TAXATION                  
Applicable tax rate (as a percent)       16.50% 16.50% 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%   25.00%      
Preferential tax rate (as a percent)       15.00%   15.00%      
Super deduction of research and development expenses (as a percent)       175.00%   175.00%      
China | Futu Network Technology (Shenzhen) Co., Ltd                  
TAXATION                  
Preferential tax rate (as a percent)             15.00% 15.00% 15.00%
Preferential tax rate, valid period             3 years 3 years  
SINGAPORE                  
TAXATION                  
Applicable tax rate (as a percent)       17.00%   17.00%