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Income tax (Schedule of Income Taxes) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥)
Income tax [Line Items] |  |  |  |
Statutory tax rate | 25.00% | 25.00% | 25.00% | 25.00%
Current tax expenses | ¥ 15,348 |  | ¥ 7,793 | ¥ 1,912
Deferred tax | 1,483 | $ 214 | (13,815) |
Income tax (benefits) expenses | 16,831 | $ 2,424 | (6,022) | 1,912
Aggregate accumulated deficit of the Company's subsidiaries and VIE located in the PRC | 7,663 |  | 85,949 |
Deferred tax liability accrued for the PRC dividend withholding taxes |  |  |  |
Hong Kong [Member] |  |  |  |
Income tax [Line Items] |  |  |  |
Statutory tax rate | 16.50% | 16.50% |  |

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- Definition Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 + Details
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