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Income tax (Movement of the Valuation Allowance) (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Income Tax [Line Items] |  |
Beginning balance | ¥ 16,368 | ¥ 26,735
Reversals | (7,971) | (10,367)
Ending balance | ¥ 8,397 | ¥ 16,368

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=75116654&loc=d3e32123-109318 + Details
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