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Share-based Compensation (Share options, June 2008 scheme) (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands	12 Months Ended
	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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Maximum percentage of ordinary shares in issue on effective date of option scheme ("Limit")

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Exercise price of the option.

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Number of ordinary shares which could be exchanged from options that affected by the plan modification.

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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.

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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

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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.

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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.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

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An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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