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Principal accounting policies (Sales and Marketing Expenses, Share based Compensation, Statutory Reserves, Dividends and Segment Reporting - Narrative) (Details) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥)
Sales and marketing expenses |  |  |
Advertising and market promotion expenses | ¥ 298,681 | ¥ 253,210 | ¥ 76,192
Employee social security and welfare benefits |  |  |
Employee social security and welfare benefits | ¥ 206,704 | 171,349 | 115,012
Minimum percentage appropriation to general reserve fund required | 10.00% |  |
Reserve level threshold for mandatory appropriation requirement (as a percent) | 50.00% |  |
Minimum percentage appropriation to statutory surplus fund required | 10.00% |  |
Surplus fund threshold for mandatory appropriation requirement (as a percent) | 50.00% |  |
Amount appropriated to statutory reserves |  |  |
Dividends |  |  |
Dividends declared | ¥ 0 | 0 | 0
Segment reporting |  |  |
Number of operating segments | 1 |  |
Statutory reserves [Member] |  |  |
Employee social security and welfare benefits |  |  |
Amount appropriated to statutory reserves | ¥ 2,350 | ¥ 38 | ¥ 15,812

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- Definition The total expense recognized in the period for promotion, public relations, and brand or product advertising. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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