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Income taxes (Details)
9 Months Ended
Sep. 30, 2022
CNY (¥)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
CNY (¥)
Income Tax Disclosure [Abstract]      
Current income tax expense ¥ 9,609 $ 1,351 ¥ 35,528
Deferred income tax benefit (1,271,720) (178,776) (301,235)
Total ¥ (1,262,111) $ (177,425) ¥ 265,707