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Share-based Compensation - Restricted share units issued by Beijing Duoke to employees of Beijing Duoke (Details) - Restricted share units ¥ in Thousands			1 Months Ended	12 Months Ended
	Jun. 19, 2017 shares	Dec. 19, 2016 shares	Dec. 31, 2016 CNY (¥) employee shares	Dec. 31, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award
Shares granted (in shares)				7,772,731
Beijing Duoke | 2016 Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares reserved for issuance (as a percent)			20.00%
Shares reserved for issuance (in shares)			157,024,000
Vesting period			4 years
Vesting rights (as a percent)			0.25%
Beijing Duoke | Employees
Share-based Compensation Arrangement by Share-based Payment Award
Shares granted (in shares)	7,772,731	63,728,544	9,382,236
Number of employees to whom the RSUs were granted | employee			5
Weighted average unvested period			4 years
Incremental compensation cost | ¥			¥ 1,920
Xieli | Employees
Share-based Compensation Arrangement by Share-based Payment Award
Number of employees to whom the RSUs were granted | employee			5
Weighted average unvested period			1 year 9 months 18 days

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- Definition

Number of employees to whom equity instruments other than options were granted during the period.

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Percentage of shares authorized for issuance under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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).

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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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