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Summary of significant accounting policies - Variable interest entity (Details) - Beijing WFOE	12 Months Ended
	Dec. 31, 2019
Shareholders' Voting Rights Proxy Agreement
Significant accounting policies
Power of attorney, term	10 years
Notice period for termination of agreement	30 days
Power of attorney, renewal period	1 year
Exclusive Business Cooperation Agreements
Significant accounting policies
Extended term of agreement	10 years
Percentage of consolidated profit, base for fees on technical support and consulting services	100.00%

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- Definition

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- Definition

The extended term of agreement, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The notice period for termination of contractual agreement, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The percentage of consolidated profit is base for fees on exclusive technical support and consulting services.

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The automatic renewable period of power of attorney after expiration, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The term of power of attorney, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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