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Equity method investments (Details) - CNY (¥) ¥ in Thousands	1 Months Ended			12 Months Ended
	Nov. 30, 2016	Jul. 31, 2016	May 31, 2006	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Apr. 30, 2018
Equity Method Investments and Joint Ventures [Abstract]
Invested amount	¥ 10,000	¥ 9,000	¥ 250
Equity interests percentage	20.00%	15.00%	30.00%
Additional investment							¥ 3,750
Recognized (loss)/gain on equity method investments				¥ (1,532)	¥ 2,658	¥ 1,668

X

- Definition

The amount of additional investment.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

the amount of equity in (loss) / income on equity method investments.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

+ Details

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X

- References

No definition available.

+ Details

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X

- Definition

The cash outflow from the amount invested for projects in hopes of getting a future return or interest from it.

+ 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
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585

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