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SHARE-BASED COMPENSATION - Share Options (Details)
$ / shares in Units, $ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Dec. 30, 2019
$ / shares
shares
Dec. 31, 2018
Oct. 31, 2014
shares
Dec. 31, 2022
$ / shares
shares
Dec. 31, 2021
$ / shares
shares
Dec. 31, 2020
$ / shares
shares
Dec. 31, 2019
HKD ($)
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Summary of the stock option activity, Options granted share Number:                
Outstanding at end of year (in shares)       9,986,146        
Summary of the stock option activity, Weighted average exercise price per option:                
Outstanding at end of year (in dollars per share) | $ / shares       $ 0.5556        
Share Options                
Summary of the stock option activity, Options granted share Number:                
Exercised (in shares)       (2,968,984) (5,875,592) (5,048,824)    
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              
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)       13,341,466 19,042,336 23,718,626    
Exercised (in shares)       (2,968,984) (5,875,592) (5,048,824)    
Granted (in shares)       0 1,080,000 2,489,832    
Cancelled/Forfeited (in shares)       (386,336) (905,278) (2,117,298)    
Outstanding at end of year (in shares)       9,986,146 13,341,466 19,042,336 23,718,626 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       $ 0.5703 $ 0.5628 $ 0.5161    
Exercised (in dollars per share) | $ / shares       0.6110 0.4365 0.4293    
Granted (in dollars per share) | $ / shares         0.0444 0.6810    
Cancelled/forfeited (in dollars per shares) | $ / shares       0.6381 0.6539 0.5588    
Outstanding at end of year (in dollars per share) | $ / shares       $ 0.5556 $ 0.5703 $ 0.5628   $ 0.5161