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Summary of significant accounting policies - Long term investments (Details)	12 Months Ended
	Dec. 31, 2019 entity	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Long-term investments
Number of significant influence entities held | entity	2
Acquired equity interest through nominee arrangement
Long-term investments
Payments to acquire equity interest			¥ 40,000,000
Equity interest acquired (in percentage)			40.00%
Jiangxi Ruijing
Long-term investments
Payments to acquire equity interest		¥ 225,000,000
Equity interest acquired (in percentage)		15.00%
Private entities
Long-term investments
Payments to acquire equity interest			¥ 15,000,000
Equity interest acquired (in percentage)			10.00%

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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- Definition

The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585

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- Definition

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.

+ References

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- Definition

Represents the number of significant influence held by the group during the period.

+ References

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