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Share-Based Compensation - Stock Option Activity (Details) - CNY (¥) ¥ / shares in Units, ¥ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of options
Outstanding as of January 1, 2019	571,474
Granted	0
Exercised	(152,410)	(201,630)	(203,174)
Forfeited	(32,359)
Outstanding as of December 31, 2019	386,705	571,474
Exercisable as of December 31, 2019	272,521
Weighted-Average Exercise Price
Outstanding as of January 1, 2019	¥ 343.14
Exercised	208.36
Forfeited	312.85
Outstanding as of December 31, 2019	398.80	¥ 343.14
Exercisable as of December 31, 2019	¥ 390.15
Weighted-Average Remaining Contractual Term
Outstanding balance	6 years 3 months 18 days	7 years
Exercisable as of December 31, 2019	7 years 2 months 12 days
Aggregate Intrinsic Value of Options
Outstanding as of January 1, 2019	¥ 34,344
Outstanding as of December 31, 2019	¥ 6,455	¥ 34,344

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract]

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Exercise Price [Abstract]

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract]

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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