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SHARE-BASED COMPENSATION - Stock Option Activity (Details) - CNY (¥)
¥ / shares in Units, ¥ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of options      
Outstanding, beginning (in shares) 14,629,096 24,779,432 28,087,236
Granted (in shares)     500,000
Exercised (in shares) (14,222,096) (10,150,336) (3,614,464)
Forfeited (in shares)     (193,340)
Outstanding, ending (in shares) 407,000 14,629,096 24,779,432
Intrinsic value of options exercised ¥ 633,606 ¥ 266,863 ¥ 77,917
Weighted average exercise price      
Outstanding, beginning (in RMB per share) ¥ 5.4 ¥ 5.3 ¥ 5.1
Granted (in RMB per share)     5.0
Exercised (in RMB per share) 5.5 5.6 5.2
Forfeited (in RMB per share)     5.0
Outstanding, ending (in RMB per share) 5.1 5.4 5.3
Weighted average grant-date fair value per option      
Outstanding, beginning (in RMB per share) 1.7 2.2 3.2
Granted (in RMB per share)     31.2
Exercised (in RMB per share) 1.6 3.5 4.5
Forfeited (in RMB per share)     6.2
Outstanding, ending (in RMB per share) ¥ 1.6 ¥ 1.7 ¥ 2.2
Options vested and expected to be vested      
Number of options 407,000    
Weighted average exercise price (in RMB per share) ¥ 5.1    
Weighted average grant-date fair value per option (in RMB per share) ¥ 1.6    
Stock options outstanding and stock options exercisable      
Number of shares 407,000    
Weighted average remaining contractual life (years) 3 months 18 days    
Weighted average exercise price (in RMB per share) ¥ 5.1    
Other disclosures      
Aggregate intrinsic value of options outstanding and exercisable ¥ 29,015    
Employee      
Other disclosures      
Unvested employee or non-employee stock options (in shares) 0 0  
Nonemployee      
Other disclosures      
Unvested employee or non-employee stock options (in shares) 0 0