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LEASES - Supplemental cash flow information related to operating leases (Details)
12 Months Ended
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
LEASES        
Cash paid for amounts included in the measurement of operating lease liabilities ¥ 2,381,173 $ 345,238 ¥ 4,813,050 ¥ 2,842,464