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SHARE-BASED COMPENSATION - Share Options (Details)
$ / shares in Units, $ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2019
HKD ($)
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
Oct. 31, 2014
shares
Dec. 31, 2021
$ / shares
shares
Dec. 31, 2020
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Summary of the stock option activity, Options granted share Number:              
Outstanding at end of year (in shares)         13,341,466    
Summary of the stock option activity, Weighted average exercise price per option:              
Outstanding at end of year (in dollars per share) | $ / shares         $ 0.5703    
Share Options              
Summary of the stock option activity, Options granted share Number:              
Exercised (in shares)         (5,875,592) (5,048,824) (106,295,232)
Share Options | Minimum              
SHARE-BASED COMPENSATION              
Vesting period (in years)       4 years 4 years    
Share Options | Maximum              
SHARE-BASED COMPENSATION              
Vesting period (in years)       5 years 5 years    
2014 Share Incentive Plan | Share Options              
SHARE-BASED COMPENSATION              
Maximum number of shares under the plan       135,032,132      
Expire period       10 years      
Modification of exercise price of number of stock options granted 8,113,145 8,113,145          
Modified of exercise price of stock options granted | $ / shares   $ 0.60          
Incremental compensation expenses $ 3,008 $ 386          
2019 Share Incentive Plan | Share Options | Maximum              
SHARE-BASED COMPENSATION              
Maximum percentage of shares available for issuance, based on total number of shares issued and outstanding on September 29, 2019     2.00%        
Maximum percentage of number of shares increased in each year     2.00%        
Maximum percentage of aggregate number of shares initially reserved and subsequently increased during the term of the total number of shares issued and outstanding on September 29     8.00%        
2014 Share Incentive Plan and 2019 Share Incentive Plan | Share Options              
Summary of the stock option activity, Options granted share Number:              
Outstanding at beginning of year (in shares)         19,042,336 23,718,626  
Exercised (in shares)         (5,875,592) (5,048,824)  
Granted (in shares)         1,080,000 2,489,832 9,791,200
Cancelled/forfeited (in shares)         (905,278) (2,117,298)  
Outstanding at end of year (in shares) 23,718,626 23,718,626     13,341,466 19,042,336 23,718,626
Summary of the stock option activity, Weighted average exercise price per option:              
Outstanding at beginning of year (in dollars per share) | $ / shares         $ 0.5628 $ 0.5161  
Exercised (in dollars per share) | $ / shares         0.4365 0.4293  
Granted (in dollars per share) | $ / shares         0.0444 0.6810  
Cancelled/forfeited (in dollars per shares) | $ / shares         0.6539 0.5588  
Outstanding at end of year (in dollars per share) | $ / shares   $ 0.5161     $ 0.5703 $ 0.5628 $ 0.5161