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Income tax (Narrative) (Details) ¥ in Thousands	Dec. 31, 2016 CNY (¥) item
Income Tax [Line Items]
Operating loss carryforwards | ¥	¥ 24,461
Number of subsidiaries provided no valuation allowance | item	2

X

- References

No definition available.

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X

- Definition

Represents the number of subsidiaries provided valuation allowance.

+ References

No definition available.

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X

- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319

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