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SIGNIFICANT ACCOUNTING POLICIES - Equity Method Investments (Details)
$ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2019
HKD ($)
Dec. 31, 2020
HKD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
HKD ($)
Dec. 31, 2018
HKD ($)
Schedule of Equity Method Investments [Line Items]          
Total consideration   $ 0 $ 0 $ 6,709 $ 0
Impairment provision on long-term investment using equity method   $ 5,888 $ 759    
Zhixiang Technology (Shenzhen) Co., Ltd          
Schedule of Equity Method Investments [Line Items]          
Ownership interest acquired 20.00%        
Total consideration $ 6,709