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SHARE BASED COMPENSATION - Stock Option Activity (Details)
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Dec. 31, 2019
CNY (¥)
shares
Number of option outstanding    
Balance as of January 1, 2019 | shares 8,453,372  
Granted | shares 0  
Exercise | shares (3,378,060)  
Forfeited | shares (520,024)  
Balance as of December 31, 2019 | shares 4,555,288  
Vested and expected to vest as of December 31,2019 | shares   4,456,440
Vested and exercisable as of December 31, 2019 | shares   4,279,300
Weighted-Average Exercise Price    
Balance as of January 1, 2019 | $ / shares $ 3.34  
Granted | $ / shares 0  
Exercise | $ / shares 3.35  
Forfeited | $ / shares 3.29  
Balance as of December 31, 2019 | $ / shares 3.34  
Vested and expected to vest as of December 31,2019 | $ / shares 3.39  
Vested and exercisable as of December 31, 2019 | $ / shares $ 3.41  
Weighted-Average Remaining Contractual Term    
Balance as of December 31 2019 4 years 8 months 23 days  
Vested and expected to vest as of December 31,2019 4 years 7 months 2 days  
Vested and exercisable as of December 31, 2019 4 years 6 months 14 days  
Aggregate Intrinsic value    
Balance as of December 31 2019 | ¥   ¥ 73,353,508
Vested and expected to vest as of December 31,2019 | ¥   70,161,689
Vested and exercisable as of December 31, 2019 | ¥   ¥ 67,601,773