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SHARE-BASED COMPENSATION - Restricted share units under 2015 plan (Details) - Restricted share units
¥ in Thousands
12 Months Ended
Dec. 31, 2020
CNY (¥)
$ / shares
shares
Dec. 31, 2020
CNY (¥)
shares
Dec. 31, 2019
CNY (¥)
shares
Dec. 31, 2018
CNY (¥)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Unvested at the beginning of the period (in shares) | shares   2,187,500    
Granted (in shares) | shares   17,995,626    
Vested (in shares) | shares   (3,750,000)    
Forfeited (in shares) | shares   (30,000)    
Unvested the end of the period (in shares) | shares   16,403,126 2,187,500  
Expected to vest | shares 16,403,126 16,403,126    
Weighted-average grant date fair value        
Unvested at the beginning of the period (in dollars per share) | $ / shares $ 2.26      
Granted (in dollars per share) | $ / shares 4.36      
Vested (in dollars per share) | $ / shares 3.72      
Forfeited (in dollars per share) | $ / shares 6.49      
Unvested at the ending of the period (in dollars per share) | $ / shares 4.22      
Expected to vest (in dollars per share) | $ / shares $ 4.22      
Stock-based compensation expense | ¥   ¥ 185,138 ¥ 38,272 ¥ 26,197
Unrecognized compensation expense | ¥ $ 368,252 ¥ 368,252    
Weighted average remaining service period   3 years 11 months 23 days