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Summary of Significant Principal Accounting Policies (Narrative) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2016 CNY (¥) $ / ¥ | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2013 CNY (¥)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Cash and cash equivalents | ¥ 917,319 | ¥ 917,319 | ¥ 917,319 | ¥ 917,319 | ¥ 787,257 | ¥ 206,391 | $ 132,121 | $ 113,389 | ¥ 154,156
Advertising expense |  | 250,096 |  |  | 208,014 | 114,777 |  |  |
Income from government subisidies |  | 4,718 |  |  | 8,686 | ¥ 1,780 |  |  |
Period over which Company will have the right to receive series of reimbursements after the closing of IPO | 5 years |  |  |  |  |  |  |  |
Reimbursements recorded as other income |  | 2,472 |  |  |  |  |  |  |
Restricted cash | ¥ 50,832 | 50,832 | 50,832 | 50,832 | 48,144 |  | $ 7,321 |  |
Letters of Credit Outstanding, Amount | ¥ 59,721 | ¥ 59,721 | ¥ 59,721 | ¥ 59,721 | ¥ 29,283 |  |  |  |
Percentage of the cash and cash equivalents denominated in specified currency | 42.10% | 42.10% | 42.10% | 42.10% | 61.00% |  | 42.10% | 61.00% |
Term of letters of guarantee | 1 year |  |  |  |  |  |  |  |
Foreign Currency Exchange Rate Weighted Average Translation Rate |  |  | 6.9430 | 6.943 |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Term of letters of guarantee | 11 months |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Term of letters of guarantee | 24 months |  |  |  |  |  |  |  |
Bank Deposits, Letters of Guarantee [Member] |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Restricted cash | ¥ 15,290 | ¥ 15,290 | ¥ 15,290 | ¥ 15,290 | ¥ 26,100 |  |  |  |
Bank Deposits, Notes Payable [Member] |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Restricted cash | 34,542 | 34,542 | 34,542 | 34,542 | 22,044 |  |  |  |
Bank Deposits Against Brand Partner [Member] |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Restricted cash | ¥ 1,000 | 1,000 | 1,000 | 1,000 | 0 |  |  |  |
Internally developed softwares [Member] |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Intangible asset, useful life | 3 years |  |  |  |  |  |  |  |
Trademarks [Member] |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Intangible asset, useful life | 10 years |  |  |  |  |  |  |  |
RMB [Member] |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Cash and cash equivalents | ¥ 386,375 | ¥ 386,375 | ¥ 386,375 | ¥ 386,375 | ¥ 480,572 |  |  |  |

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