Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of non-vested options canceled.

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Share-based compensation (Details)										12 Months Ended
Share-based compensation (Details)	Nov. 10, 2021 shares	Apr. 30, 2019 shares	Oct. 31, 2018 shares	May 09, 2018 $ / shares shares	Apr. 30, 2018 shares	Oct. 11, 2017 shares	May 03, 2016 shares	Jun. 29, 2015 shares	Jan. 25, 2015 shares	Dec. 31, 2022 CNY (¥) ¥ / shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 CNY (¥) ¥ / shares	Dec. 31, 2020 CNY (¥) ¥ / shares
Share-based compensation
Number of shares granted		155,000	475,000	40,000,000	841,054	16,616,000	7,425,000	630,000	13,843,645
Expiration period (in years)										10 years	10 years
Exercise price (in dollars per share) \| $ / shares				$ 4.75
Share-based compensation expense										¥ 10,740,648	$ 1,557,248	¥ 71,849,299	¥ 70,588,710
Weighted-average grant date fair value of the options \| ¥ / shares										¥ 9.87		¥ 9.58	¥ 9.99
Minimum [Member]
Share-based compensation
Vesting period (in years)										3 years	3 years
Maximum [Member]
Share-based compensation
Vesting period (in years)										4 years	4 years
Stock options.
Share-based compensation
Unvested share options granted	9,429,984