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NET INCOME (LOSS) PER ORDINARY SHARE - Basic and diluted net income (loss) per share computation (Details)
 12 Months Ended
Dec. 31, 2023
CNY (¥)
¥ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
CNY (¥)
¥ / shares
shares
Dec. 31, 2021
CNY (¥)
¥ / shares
shares
Numerator:        
Net income (loss) ¥ (271,835,982) $ (38,287,297) ¥ (49,462,929) ¥ 225,820,409
Denominator:        
Weighted average number of ordinary shares outstanding 154,795,461 154,795,461 154,109,051 153,174,715
Weighted average number of ordinary shares equivalents outstanding 2,020,644 2,020,644 1,067,871 497,643
Denominator for basic net income (loss) per ordinary share 156,816,105 156,816,105 155,176,922 153,672,358
Dilutive effect of outstanding share options       4,366,690
Dilutive effect of unvested restricted share units       2,421,928
Denominator for diluted net income (loss) per ordinary share 156,816,105 156,816,105 155,176,922 160,460,976
Net income (loss) per ordinary share        
-Basic | (per share) ¥ (1.73) $ (0.24) ¥ (0.32) ¥ 1.47
-Diluted | (per share) ¥ (1.73) $ (0.24) ¥ (0.32) ¥ 1.41