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Share-based compensation - Restricted stocks unit (Details)				12 Months Ended
	Nov. 20, 2019 shares	Aug. 13, 2019 shares	Apr. 15, 2019 shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2019 CNY (¥) ¥ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration term				10 years	10 years
Stock options cancelled (in shares)				3,452,998	3,452,998
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term				3 years	3 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term				4 years	4 years
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted				3,689,400	3,689,400
Expiration term			0 years	10 years	10 years
Share-based Goods and Nonemployee Services Transaction, Modification of Terms, Incremental Compensation Cost				$ 51,796	¥ 360,592
Number of Restricted Shares
Granted (in shares)				3,689,400	3,689,400
Vested (in shares)				49,998	49,998
Outstanding ending balance (in shares)				3,639,402	3,639,402
Weighted-Average Grant-Date Fair Value
Granted (in dollars per share) | ¥ / shares					¥ 8.21
Vested (in dollars per share) | ¥ / shares					17.60
Outstanding ending balance (in dollars per share) | ¥ / shares					¥ 8.21
Restricted stock units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term			2 years	3 years	3 years
Restricted stock units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term			3 years	4 years	4 years
Restricted stock units | Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted			150,000
Number of Restricted Shares
Granted (in shares)			150,000
Restricted stock units | Certain employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted	1,789,400
Number of Restricted Shares
Granted (in shares)	1,789,400
Restricted stock units | Certain senior managements
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted	250,000	1,500,000
Stock options cancelled (in shares)	250,000	1,500,000
Number of Restricted Shares
Granted (in shares)	250,000	1,500,000

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- Definition

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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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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The excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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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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