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Share-based compensation (Details)												12 Months Ended
	Apr. 30, 2019 shares	Oct. 31, 2018 shares	May 10, 2018 USD ($)	May 10, 2018 CNY (¥)	May 09, 2018 USD ($) shares	May 09, 2018 CNY (¥) ¥ / shares shares	Apr. 30, 2018 shares	Oct. 11, 2017 shares	May 03, 2016 shares	Jun. 29, 2015 shares	Jan. 25, 2015 shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2019 CNY (¥) ¥ / shares shares	Dec. 31, 2018 CNY (¥) ¥ / shares	Dec. 31, 2017 CNY (¥)
Share-based compensation
Number of shares granted | shares	155,000	475,000			40,000,000	40,000,000	841,054	16,616,000	7,425,000	630,000	13,843,645	155,000	155,000
Expiration period (in years)												10 years	10 years
Exercise price (in dollars per share)						¥ 4.75
Share-based compensation expense			$ 1,332,770	¥ 9,163,461	$ 2,357,666	¥ 16,210,135						$ 21,681,689	¥ 150,943,580	¥ 171,836,485	¥ 74,009,575
Service period (in years)					5 years	5 years
Weighted-average grant date fair value of the options													¥ 10.33	¥ 13.08
Minimum
Share-based compensation
Vesting period (in years)												3 years	3 years
Maximum
Share-based compensation
Vesting period (in years)												4 years	4 years
Exercise price (in dollars per share)													¥ 31.96

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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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Share-based compensation expense period from service inception date on a straight line basis.

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