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LONG-TERM INVESTMENTS - Additional Information (Details)
$ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2022
HKD ($)
Dec. 31, 2021
HKD ($)
Jan. 31, 2019
HKD ($)
Dec. 31, 2022
HKD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2020
HKD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
LONG-TERM INVESTMENTS                
Equity method investments $ 235,434 $ 7,798 $ 6,709 $ 224,042        
Loss on investment       17,752 $ 2,275 $ 307    
Impairment provision of equity method investments   5,888   5,888     $ 0 $ 0
Equity investments without readily determinable fair values   15,596   15,652        
Impairment provision of equity investments without readily determinable fair values   $ 0   $ 0        
TH Fund LP                
LONG-TERM INVESTMENTS                
Percentage of equity interest (as a percent) 16.00% 10.00% 20.00%          
Newflow Amity Fund I, LP                
LONG-TERM INVESTMENTS                
Percentage of equity interest (as a percent)   2.75%