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Share-Based Compensation (Narrative) (Details) ¥ / shares in Units, ¥ in Thousands |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |
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Mar. 03, 2016 CNY (¥) shares | Aug. 14, 2015 ¥ / shares $ / shares shares | May 20, 2015 ¥ / shares shares | May 05, 2015 shares | Feb. 06, 2015 ¥ / shares shares | Aug. 30, 2014 ¥ / shares shares | Dec. 31, 2011 ¥ / shares shares | Dec. 31, 2016 CNY (¥) ¥ / shares shares | Dec. 31, 2015 CNY (¥) ¥ / shares shares | Dec. 31, 2014 CNY (¥) ¥ / shares shares | Dec. 31, 2013 ¥ / shares shares | Dec. 31, 2012 ¥ / shares shares | Mar. 03, 2016 $ / shares
Share-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average grant date fair value | ¥ / shares |  |  |  |  |  |  |  |  | ¥ 13.43 | ¥ 13.32 |  |  |
Total intrinsic value of options exercised | ¥ |  |  |  |  |  |  |  | ¥ 50,199 |  |  |  |  |
Unrecognized compensation expense | ¥ |  |  |  |  |  |  |  | ¥ 37,865 |  |  |  |  |
Unrecognized compensation expense, recognition period | 2 years 10 months 20 days |  |  |  |  |  |  | 1 year 10 months 24 days |  |  |  |  |
Share options granted | shares |  |  |  |  |  | 5,903,533 |  | 0 | 4,472,745 | 8,892,833 |  |  |
Exercise price of share options granted (in dollars per share) | ¥ / shares |  |  |  |  |  | ¥ 0.1 |  |  |  |  |  |  |
Allocated Share-based Compensation Expense | ¥ |  |  |  |  |  |  |  | ¥ 34,185 | ¥ 25,195 | ¥ 84,963 |  |  |
Share-based Payment Award, Options, Outstanding | shares | 2,098,111 |  |  |  |  |  |  | 12,852,197 | 16,574,854 | 15,153,023 | 7,515,838 |  |
Weighted Average Exercise Price Outstanding | ¥ / shares |  |  |  |  |  |  |  | ¥ 2.2 | ¥ 3.5 | ¥ 0.1 | ¥ 0.1 |  |
Nonemployee Services Transaction, Modification of Terms, Incremental Compensation Cost | ¥ | ¥ 3,432 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Award, Compensation Cost | ¥ | 956 |  |  |  |  |  |  |  |  |  |  |  |
Nonvested Awards, Compensation Cost Not yet Recognized | ¥ | ¥ 2,476 |  |  |  |  |  |  |  |  |  |  |  |
2014 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized | shares |  |  |  |  |  |  |  | 20,331,467 |  |  |  |  |
2015 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized | shares |  |  |  | 4,400,000 |  |  |  |  |  |  |  |  |
Expiration period |  |  |  | 10 years |  |  |  |  |  |  |  |  |
Description and terms of unissued shares reserved under the Plan |  |  |  |  |  |  |  | On December 31, 2016, as the unissued Shares reserved under the 2015 Plan account for less than 1.5% of the then total issued and outstanding shares on an as-converted basis, on January 1, 2017, the number of shares reserved for future issuances under the 2015 Plan was automatically increased to 1.5% of the then total issued and outstanding Shares. |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price Outstanding | $ / shares |  | $ 1.5 |  |  |  |  |  |  |  |  |  |  | $ 0.0001
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price Outstanding | $ / shares |  | $ 2.87 |  |  |  |  |  |  |  |  |  |  | $ 1.5
Restricted share units [Member] | 2015 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Granted | shares |  |  |  |  |  |  |  | 3,663,574 | 3,976,311 |  |  |  |
Management and employees |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share options granted | shares |  |  |  |  | 3,949,975 |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 4 years |  |  |  |  |  |  |  |
Management and employees | 2015 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share options granted | shares |  | 452,770 |  |  |  |  |  |  |  |  |  |  |
Vesting period |  | 4 years |  |  |  |  |  |  |  |  |  |  |
Management and employees | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of share options granted (in dollars per share) | ¥ / shares |  |  |  |  | ¥ 9.2 |  |  |  |  |  |  |  |
Management and employees | Minimum [Member] | 2015 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of share options granted (in dollars per share) | ¥ / shares |  | $ 11.67 |  |  |  |  |  |  |  |  |  |  |
Management and employees | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of share options granted (in dollars per share) | ¥ / shares |  |  |  |  | ¥ 17.6 |  |  |  |  |  |  |  |
Management and employees | Maximum [Member] | 2015 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of share options granted (in dollars per share) | ¥ / shares |  | $ 18.6 |  |  |  |  |  |  |  |  |  |  |
Senior management and a consultant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share options granted | shares |  |  |  |  |  |  |  |  |  |  | 74,209 | 932,414 |
Exercise price of share options granted (in dollars per share) | ¥ / shares |  |  |  |  |  |  |  |  |  |  | ¥ 0.1 | ¥ 0.1 |
Directors, senior management and employees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share options granted | shares |  |  |  |  |  |  | 3,443,615 |  |  |  | 3,525,191 | 366,008 |
Exercise price of share options granted (in dollars per share) | ¥ / shares |  |  |  |  |  |  | ¥ 0.1 |  |  |  | ¥ 0.1 | ¥ 0.1 |
Vesting period |  |  |  |  |  |  | 4 years |  |  |  | 4 years | 4 years |
Senior management [Member] | 2014 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share options granted | shares |  |  | 70,000 |  |  |  |  |  |  |  |  |  |
Exercise price of share options granted (in dollars per share) | ¥ / shares |  |  | ¥ 0.001 |  |  |  |  |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |  |  |  |  |  |  |  |
Employees and senior management [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share options granted | shares |  |  |  |  |  | 2,989,300 |  |  |  |  |  |  |
Exercise price of share options granted (in dollars per share) | ¥ / shares |  |  |  |  |  | ¥ 0.1 |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 4 years |  |  |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Description of significant modifications (such as a change in expiration dating, vesting rights, or exercise prices) to an equity-based compensation plan, including the terms of the modifications. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The excess of the fair value of the modified award over the fair value of the award immediately before the modification. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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