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Share-based compensation - Stock option valuation (Details) - ¥ / shares	Apr. 30, 2019	Oct. 31, 2018	May 09, 2018	Apr. 30, 2018	Oct. 11, 2017	May 03, 2016	Jun. 29, 2015	Jan. 25, 2015	Dec. 31, 2019	Dec. 31, 2018
Share-based compensation
Fair value of underlying ordinary shares (in dollars per share)	¥ 16.65	¥ 26.74	¥ 38.14	¥ 41.33	¥ 30.29	¥ 16.98	¥ 9.66	¥ 4.91
Exercise Price (in dollars per share)	¥ 31.96	¥ 27.93	¥ 30.27	¥ 25.42			¥ 0.27	¥ 0.27
Expected Volatility per annum (as a percent)	30.15%	43.90%	39.30%	45.47%	38.60%	42.00%	38.00%	43.00%
Risk-Free Rate (as a percent)	2.97%	3.15%	2.94%	2.96%	2.35%	1.81%	2.33%	1.81%
Exercise Multiple	0.0	2.5		2.5	2.5	2.5	2.5	2.5
Dividend Yield ( as a percent )
Time to Maturity (Years)	10 years	10 years	5 years	10 years	10 years	10 years	10 years	10 years
Minimum
Share-based compensation
Exercise Price (in dollars per share)					¥ 0.27	¥ 0.27			¥ 0.27	¥ 0.27
Exercise Multiple			5.58
Maximum
Share-based compensation
Exercise Price (in dollars per share)					¥ 27.02	¥ 10.71			¥ 31.96	¥ 30.27
Exercise Multiple			(38.33)

X

- Definition

Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

+ References

No definition available.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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-Publisher FASB
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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB
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The exercise multiple factor assumption that is used in valuing an option on its own shares.

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