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SHARE-BASED COMPENSATION - Share Options (Details) - Share Options
$ / shares in Units, $ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Dec. 30, 2019
USD ($)
$ / shares
shares
Dec. 30, 2019
HKD ($)
shares
Oct. 31, 2019
Oct. 31, 2014
shares
Dec. 31, 2019
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Dec. 31, 2017
$ / shares
shares
Summary of the stock option activity, Options granted share Number:              
Exercisable (in shares)         (106,295,232) 0 0
Outstanding at end of year (in shares)         23,718,626    
Summary of the stock option activity, Weighted average exercise price:              
Outstanding at end of year (in dollars per share) | $ / shares         $ 0.5161    
Minimum              
SHARE-BASED COMPENSATION              
Vesting period (in years)         4 years    
Maximum              
SHARE-BASED COMPENSATION              
Vesting period (in years)         5 years    
2014 Share Incentive Plan              
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 $ 0.4 $ 3          
2014 Share Incentive Plan | Minimum              
SHARE-BASED COMPENSATION              
Vesting period (in years)       4 years      
2014 Share Incentive Plan | Maximum              
SHARE-BASED COMPENSATION              
Vesting period (in years)       5 years      
2019 Share Incentive Plan | 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              
Summary of the stock option activity, Options granted share Number:              
Outstanding at beginning of year (in shares)         121,207,838 111,624,775 111,407,320
Exercisable (in shares)         (106,295,232)    
Granted (in shares)         9,791,200 9,625,690 217,455
Cancelled/forfeited (in shares)         (985,180) (42,627)  
Outstanding at end of year (in shares)         23,718,626 121,207,838 111,624,775
Summary of the stock option activity, Weighted average exercise price:              
Outstanding at beginning of year (in dollars per share) | $ / shares         $ 0.1049 $ 0.0186 $ 0.0168
Granted (in dollars per share) | $ / shares         0.6500 1.1065 0.9188
Exercised (in dollars per share) | $ / shares         0.0126    
Cancelled/forfeited (in dollars per shares) | $ / shares         0.8402 0.2000  
Outstanding at end of year (in dollars per share) | $ / shares         $ 0.5161 $ 0.1049 $ 0.0186