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Share-based Compensation (Share options, June 2008 scheme) (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 CNY (¥) shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum percentage of ordinary shares in issue upon exercise of all outstanding options granted and yet to be exercised | 30.00% | 30.00% |  |
Recognized share-based compensation | ¥ 1,890 | $ 273 | ¥ 34,354 | ¥ 53,181
Share Option Scheme, June 2008 Scheme [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum percentage of the ordinary shares in issue on effective date of option scheme ("Limit") | 10.00% | 10.00% |  |
Maximum percentage of ordinary shares in issue on effective date of limit as refreshed (Refreshed "Limit") | 10.00% | 10.00% |  |
Maximum number of additional options authorized to grant | shares | 31,410,107 | 31,410,107 |  |
Share options, expiration period | 10 years | 10 years |  |
Award vesting period | 4 years | 4 years |  |
Share Option Scheme, June 2008 Scheme, Plan Modification [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period added | 12 months | 12 months |  |
Total incremental share-based compensation | ¥ 12,100 | $ 1,700 |  |
Recognized share-based compensation | ¥ 2,700 | $ 400 |  |
Share Option Scheme, June 2008 Scheme, Plan Modification [Member] | Class A ordinary shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of Ordinary Shares Affected | shares | 21,011,951 | 21,011,951 |  |
New Exercise Price | $ / shares |  | $ 0.4823 |  |
Share Option Scheme, June 2008 Scheme, Plan Modification [Member] | ADS [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
New Exercise Price | $ / shares |  | $ 3.8587 |  |

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- Definition Maximum percentage of ordinary shares in issue on effective date of option scheme ("Limit") + References No definition available. + Details
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- Definition Exercise price of the option. + References No definition available. + Details
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- Definition Vesting period added for new options granted by the Company under the same plan, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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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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