Financial investments (Details)	12 Months Ended
Dec. 31, 2022 CNY (¥)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 CNY (¥)
Financial investments
Investments	¥ 120,965,647		$ 17,538,370	¥ 82,843,800
Aggregate amount invested in two VC fund	69,646,000	$ 10,097,721
Impairment	8,874,750	1,286,718
Aggregate amount invested in one VC fund	20,893,800	3,029,316
Decrease of fair value	9,525,822	$ 1,381,114
Dragonfly Ventures Feeder, L.P.
Financial investments
Investments	94,890,623		13,757,847	63,726,000
IOSG Fund II LP
Financial investments
Investments	¥ 26,075,024		$ 3,780,523	¥ 19,117,800

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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