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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 Percentage of shares authorized for issuance under share-based payment arrangement. + References No definition available. + Details
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- Definition Weighted average unvested period, 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. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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