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ORDINARY SHARES PURCHASE WARRANTS ISSUED TO INVESTORS - Measurement inputs (Details)
Dec. 31, 2021
¥ / shares
Jun. 30, 2021
¥ / shares
Jun. 14, 2021
¥ / shares
Jun. 26, 2020
May 21, 2020
Stock price          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Warrants outstanding, measurement input 1.31 4.33 5.01    
Risk-free interest rate          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Warrants outstanding, measurement input 1.25 0.95 0.90 0.35 0.40
Volatility          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Warrants outstanding, measurement input 109 111 111 104.26 99.50
Exercise price          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Warrants outstanding, measurement input 6.24 6.24 6.24    
Warrant life          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Warrants outstanding, measurement input 5.0 5.5 5.5