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Financing with a financial institution (Details)
$ in Millions
1 Months Ended 12 Months Ended
Jul. 24, 2020
CNY (¥)
Jul. 31, 2020
CNY (¥)
Jul. 31, 2020
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2020
CNY (¥)
Jul. 24, 2020
USD ($)
Debt Instrument            
Total proceeds of the Convertible Note and the Loan, net of issuance cost         ¥ 278,870,000  
Proceeds from Issuance of Long-Term Debt   ¥ 278,900,000 $ 39.9      
Option            
Debt Instrument            
Option term 24 months          
Derivative liabilities - Fair value of the Option ¥ 15,400,000     ¥ 0    
Change in fair value of option and embedded conversion feature       ¥ 10,300,000    
Convertible Notes            
Debt Instrument            
Principal amount | $           $ 27.0
Interest rate per annum 7.00%         7.00%
Maturity term 24 months          
Loan            
Debt Instrument            
Principal amount | $           $ 13.0
Interest rate per annum 7.50%         7.50%
Maturity term 24 months          
Interest rate of the required to be paid periodically 7.00%          
Frequency of periodic payment annually          
Interest rate applied at the final payment. 0.50%          
Term when final interest payment is applied 24 months