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Other income - Additional information (Details)
 1 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
CNY (¥)
Jun. 30, 2022
USD ($)
Jun. 30, 2022
CNY (¥)
Other income            
Initial payment from depositary $ 4,690,000 ¥ 30,995,000        
Arrangement period for amortization     5 years 5 years    
Rebate of fees received     $ 1,107,000 ¥ 7,940,000    
Paycheck Protection Program | Subsidiaries            
Other income            
Subsidy amount received         $ 1,320,000 ¥ 8,548,000