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Short-term bank borrowings (Details) - PRC bank
1 Months Ended 12 Months Ended
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Short-term bank borrowings and Restricted cash        
Debt term 3 years 1 year    
Maximum borrowing capacity ¥ 700,000,000 ¥ 700,000,000    
Interest rate (in percent) 2.08% 2.08%    
Outstanding balances of loans drawn ¥ 198,000,000 ¥ 198,000,000 $ 29,159,126 ¥ 203,000,000