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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, 2015 CNY (¥) item | Dec. 31, 2014 CNY (¥) | Dec. 31, 2013 CNY (¥)
Sales and marketing expenses |  |  |
Advertising and market promotion expenses | ¥ 253,210 | ¥ 76,192 | ¥ 8,054
Employee social security and welfare benefits |  |  |
Employee social security and welfare benefits | ¥ 171,349 | ¥ 115,012 | ¥ 68,334
Statutory reserves [Line Item] |  |  |
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 | item | 1 |  |
Statutory reserves [Member] |  |  |
Statutory reserves [Line Item] |  |  |
Amount appropriated to statutory reserves | ¥ 38 | ¥ 15,812 | ¥ 40,657

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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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=26872669&loc=d3e20235-122688 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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