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Prepaid expense and other current assets - Additional information (Details)
 1 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2020
CNY (¥)
Nov. 09, 2019
Dec. 31, 2019
USD ($)
item
Dec. 31, 2019
CNY (¥)
item
Jan. 30, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Prepaid Expense and Other Assets, Current, Disclosure [Line Items]            
Principal amount of loan assets | $     $ 15,600,000      
Remaining amount receivable     $ 54,583,585     ¥ 380,000,000
Jiangxi Ruijing            
Prepaid Expense and Other Assets, Current, Disclosure [Line Items]            
Number of earnings rights purchased | item     2 2    
Jiangxi Ruijing | Loan 1            
Prepaid Expense and Other Assets, Current, Disclosure [Line Items]            
Principal amount of loan assets     $ 14,364,101 ¥ 100,000,000    
Interest rate (as a percent) 15.60%          
Jiangxi Ruijing | Loan 1 | Subsequent Event            
Prepaid Expense and Other Assets, Current, Disclosure [Line Items]            
Amount received from repayments ¥ 30,000,000          
Remaining amount receivable         ¥ 70,000,000  
Jiangxi Ruijing | Loan 2            
Prepaid Expense and Other Assets, Current, Disclosure [Line Items]            
Principal amount of loan assets     $ 40,219,483 ¥ 280,000,000    
Interest rate (as a percent)   8.00%