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SHARE BASED COMPENSATION - Stock Option Activity (Details)
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Dec. 31, 2020
CNY (¥)
shares
Number of option outstanding    
Balance as of January 1, 2020 | shares 4,555,288  
Granted | shares 0  
Exercise | shares (3,750,540)  
Forfeited | shares (88,000)  
Balance as of December 31, 2020 | shares 716,748  
Vested and expected to vest as of December 31,2019 | shares   689,968
Vested and exercisable as of December 31, 2019 | shares   592,760
Weighted-Average Exercise Price    
Balance as of January 1, 2019 | $ / shares $ 3.34  
Granted | $ / shares 0  
Exercise | $ / shares 3.32  
Forfeited | $ / shares 3.29  
Balance as of December 31, 2019 | $ / shares 3.46  
Vested and expected to vest as of December 31,2019 | $ / shares 3.63  
Vested and exercisable as of December 31, 2019 | $ / shares $ 3.69  
Weighted-Average Remaining Contractual Term    
Balance as of December 31 2019 5 years 3 months  
Vested and expected to vest as of December 31,2019 4 years 29 days  
Vested and exercisable as of December 31, 2019 3 years 9 months 14 days  
Aggregate Intrinsic value    
Balance as of December 31 2019 | ¥   ¥ 58,835,911
Vested and expected to vest as of December 31,2019 | ¥   53,289,086
Vested and exercisable as of December 31, 2019 | ¥   ¥ 45,563,647