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SHARE-BASED COMPENSATION - Employee option activity (Details) - Stock Options
$ / shares in Units, ¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2019
CNY (¥)
shares
Summary of employee option activity under the Plan          
Outstanding at beginning of the year (in shares) | shares 8,890,629 3,899,325 3,461,650    
Granted (in shares) | shares 1,063,293 5,296,204 2,303,900    
Forfeited (in shares) | shares (2,086,050) (304,900) (1,866,225)    
Exercised (in shares) | shares (1,962,484)        
Outstanding at end of the year (in shares) | shares 5,905,388 8,890,629 3,899,325 3,461,650  
Vested and Exercisable at end of the year (in shares) | shares         1,960,367
Vested and expected to vest at end of the year (in shares) | shares         5,905,388
Weighted Average Exercise Price          
Outstanding at beginning of the year (in dollars per share) | $ / shares $ 1.76 $ 1.22 $ 1.00    
Share options granted (in dollars per share) | $ / shares 4.12 2.17 1.84    
Forfeited (in dollars per share) | $ / shares 1.99 1.96 1.56    
Exercised (in dollars per share) | $ / shares 0.76        
Outstanding at end of the year (in dollars per share) | $ / shares 2.44 $ 1.76 $ 1.22 $ 1.00  
Vested and Exercisable at end of the year (in dollars per share) | $ / shares 1.87        
Vested and expected to vest at end of the year (in dollars per share) | $ / shares $ 2.44        
Weighted average remaining contractual term          
Outstanding (in years) 7 years 11 months 16 days 8 years 3 months 11 days 7 years 11 months 23 days 8 years 5 months 16 days  
Vested and Exercisable (in years) 3 years 10 months 6 days        
Vested and expected to vest (in years) 7 years 11 months 16 days        
Average intrinsic value          
Outstanding at beginning of the year | $ $ 36,888 $ 7,970 $ 3,843    
Outstanding at end of the year | $ $ 22,807 $ 36,888 $ 7,970 $ 3,843  
Vested and Exercisable at end of the year | ¥         ¥ 7,151
Vested and expected to vest at end of the year | ¥         ¥ 22,807