Amount receivable from exercise of stock options.

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- Definition

Represents the information pertains to share based compensation arrangement by share based payment award vesting schedule period

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No definition available.

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- Definition

Represents the exercise multiple which is estimated as the ratio of fair value of underlying shares over the exercise price as at the time the option is exercise.

+ References

No definition available.

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- Definition

The fair value of the underlying shares on the date of option grants that is used in valuing an option on its own shares.

+ References

No definition available.

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No definition available.

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N/A

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No definition available.

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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
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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

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- Definition

Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References

No definition available.

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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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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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The weighted average fair value at grant date for nonvested equity-based awards issued 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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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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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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No definition available.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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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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No definition available.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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- References

No definition available.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

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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No definition available.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

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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- Definition

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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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

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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- Definition

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

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No definition available.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

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

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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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No definition available.

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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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- References

No definition available.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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- Definition

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

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No definition available.

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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 per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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Percentage of vesting of share-based compensation awards.

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Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

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No definition available.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Share-based compensation (Details 2) $ / shares in Units, ¥ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2017 CNY (¥) shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2016 CNY (¥) shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2015 CNY (¥) shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2017 CNY (¥) shares
Additional disclosures
Share-based compensation expenses \| ¥		¥ 2,780,062		¥ 2,061,432		¥ 1,076,286
Share Incentive Plan
Share-based compensation
Number of ordinary shares available for future grants	112,408,197							112,408,197
Share Incentive Plan \| Employee and non-employee
Share-based compensation
Term of vesting schedule period			6 years	6 years
Share Incentive Plan \| Employee and non-employee \| Unvested RSUs \| Vesting Based On Service
Number of Shares
Unvested at the beginning of the year (in shares)	82,847,816	82,847,816	39,411,522	39,411,522	32,118,491	32,118,491
Granted (in shares)	41,450,212	41,450,212	59,254,734	59,254,734	18,595,642	18,595,642
Vested (in shares)	(12,005,700)	(12,005,700)	(8,692,792)	(8,692,792)	(7,368,335)	(7,368,335)
Forfeited (in shares)	(6,246,436)	(6,246,436)	(7,125,648)	(7,125,648)	(3,934,276)	(3,934,276)
Unvested at the end of the year (in shares)	106,045,892	106,045,892	82,847,816	82,847,816	39,411,522	39,411,522	32,118,491
Weighted-Average Grant-Date Fair Value
Unvested at the beginning of the year (in dollars per share) \| $ / shares	$ 11.97		$ 9.58		$ 5.80
Granted (in dollars per share) \| $ / shares	16.27		12.82		14.35
Vested (in dollars per share) \| $ / shares	10.14		7.98		5.05
Forfeited (in dollars per share) \| $ / shares	13.42		10.66		9.73
Unvested at the end of the year (in dollars per share) \| $ / shares	$ 13.77		$ 11.97		$ 9.58		$ 5.80
Additional disclosures
Share-based compensation expenses \| ¥		¥ 2,462,881		¥ 1,613,204		¥ 714,047
Unrecognized share-based compensation expense related to awards other than options \| ¥								¥ 5,840,090
Weighted-average period over which share-based compensation expense is expected to be recognized	5 years 9 months 18 days	5 years 9 months 18 days
Total fair value of RSUs vested \| $	$ 213,155,000		$ 111,956,000		$ 116,799,000
Total intrinsic value of RSUs vested \| $	$ 213,155,000		$ 111,956,000		$ 116,799,000
Share Incentive Plan \| Employee and non-employee \| Unvested RSUs \| Vesting Based On Performance
Number of Shares
Unvested at the beginning of the year (in shares)	310,002	310,002	876,364	876,364	1,466,658	1,466,658
Vested (in shares)	(96,516)	(96,516)	(118,540)	(118,540)	(188,936)	(188,936)
Forfeited (in shares)			(447,822)	(447,822)	(401,358)	(401,358)
Unvested at the end of the year (in shares)	213,486	213,486	310,002	310,002	876,364	876,364	1,466,658
Weighted-Average Grant-Date Fair Value
Unvested at the beginning of the year (in dollars per share) \| $ / shares	$ 6.33		$ 6.33		$ 6.33
Vested (in dollars per share) \| $ / shares	6.33		6.33		6.33
Forfeited (in dollars per share) \| $ / shares			6.33		6.33
Unvested at the end of the year (in dollars per share) \| $ / shares	$ 6.33		$ 6.33		$ 6.33		$ 6.33
Additional disclosures
Share-based compensation expenses \| ¥		¥ 1,157		¥ 4,334		¥ 4,630
Unrecognized share-based compensation expense related to awards other than options \| ¥								¥ 1,095
Weighted-average period over which share-based compensation expense is expected to be recognized	1 year 1 month 6 days	1 year 1 month 6 days
Total fair value of RSUs vested \| $	$ 1,371,000		$ 1,524,000		$ 2,347,000
Total intrinsic value of RSUs vested \| $	$ 1,371,000		$ 1,524,000		$ 2,347,000
Share Incentive Plan \| Employee and non-employee \| Options \| Vesting Based On Service
Number of share options
Outstanding at the beginning of the year (in shares)	21,659,016	21,659,016	27,434,622	27,434,622	26,201,252	26,201,252
Granted (in shares)	0	0	0	0	5,652,500	5,652,500
Exercised	(4,116,816)	(4,116,816)	(2,820,648)	(2,820,648)	(2,694,404)	(2,694,404)
Forfeited or cancelled (in shares)	(432,092)	(432,092)	(2,954,958)	(2,954,958)	(1,724,726)	(1,724,726)
Outstanding at the end of the year (in shares)	17,110,108	17,110,108	21,659,016	21,659,016	27,434,622	27,434,622	26,201,252
Vested and expected to vest at the end of the year (in shares)	16,110,208							16,110,208
Exercisable at the end of the year (in shares)	8,777,612							8,777,612
Weighted Average Exercise Price
Outstanding at the beginning of the year (in dollars per share) \| $ / shares	$ 6.23		$ 6.10		$ 4.37
Granted (in dollars per share) \| $ / shares					13.17
Exercised (in dollars per share) \| $ / shares	5.20		3.97		4.07
Forfeited or cancelled (in dollars per share) \| $ / shares	5.92		7.21		6.07
Outstanding at the end of the year (in dollars per share) \| $ / shares	6.49		$ 6.23		$ 6.10		$ 4.37
Vested and expected to vest at the end of the year (in dollars per share) \| $ / shares	6.41
Exercisable at the end of the year (in dollars per share) \| $ / shares	$ 5.31
Weighted Average Remaining Contractual Term (years)
Outstanding at the end of the year	6 years 2 months 12 days	6 years 2 months 12 days	7 years 3 months 18 days	7 years 3 months 18 days	8 years 1 month 6 days	8 years 1 month 6 days	8 years 6 months
Vested and expected to vest at the end of the year	6 years 2 months 12 days	6 years 2 months 12 days
Exercisable at the end of the year	5 years 10 months 24 days	5 years 10 months 24 days
Aggregate Intrinsic Value
Outstanding at the end of the year (in dollars) \| $	$ 243,327,000		$ 142,433,000		$ 275,040,000		$ 189,729,000
Vested and expected to vest at the end of the year (in dollars) \| $	230,350,000
Exercisable at the end of the year (in dollars) \| $	$ 135,192,000
Additional disclosures
Share-based compensation expenses \| ¥		¥ 60,739		¥ 125,225		¥ 103,962
Weighted average grant date fair value of options granted \| $ / shares					$ 5.59
Unrecognized share-based compensation expense related to options \| ¥								¥ 77,383
Weighted-average period over which share-based compensation expense is expected to be recognized	3 years 7 months 6 days	3 years 7 months 6 days
Total intrinsic value of options exercised \| $	$ 55,278,000		23,796,000		$ 29,522,000
Cash received from the exercises of share options \| $	19,942,000		12,454,000		$ 12,332,000
Cash Receivable From Stock Option Exercises \| $	$ 2,201,000		$ 747,000
Assumptions used to calculate estimated fair value of each option grant
Expected dividend yield (as a percent)					0.00%	0.00%
Expected term (in years)					10 years	10 years
Share Incentive Plan \| Employee and non-employee \| Options \| Vesting Based On Service \| Minimum
Assumptions used to calculate estimated fair value of each option grant
Expected volatility (as a percent)					33.00%	33.00%
Risk-free interest rate (per annum) (as a percent)					2.17%	2.17%
Exercise multiples					2.0	2.0
Expected dividend yield (as a percent)					0.00%	0.00%
Fair value of the underlying shares on the date of option grants (in dollars) \| $					$ 11.57
Share Incentive Plan \| Employee and non-employee \| Options \| Vesting Based On Service \| Maximum
Assumptions used to calculate estimated fair value of each option grant
Expected volatility (as a percent)					50.00%	50.00%
Risk-free interest rate (per annum) (as a percent)					2.65%	2.65%
Exercise multiples					2.8	2.8
Fair value of the underlying shares on the date of option grants (in dollars) \| $					$ 14.69
Share Incentive Plan \| Non-employees \| Unvested RSUs \| Vesting Based On Service
Number of Shares
Unvested at the beginning of the year (in shares)	1,052,398	1,052,398
Unvested at the end of the year (in shares)	5,719,884	5,719,884	1,052,398	1,052,398
Share Incentive Plan \| Non-employees \| Options \| Vesting Based On Service
Number of share options
Outstanding at the beginning of the year (in shares)	0	0
Outstanding at the end of the year (in shares)	1,379,780	1,379,780	0	0
Share Incentive Plan \| Year two \| Employee and non-employee
Share-based compensation
Year in which shares are vested			2 years	2 years
Vesting percentage (as a percent)			50.00%	50.00%
Share Incentive Plan \| Year three \| Employee and non-employee
Share-based compensation
Year in which shares are vested			3 years	3 years
Vesting percentage (as a percent)			33.00%	33.00%
Share Incentive Plan \| Year four \| Employee and non-employee
Share-based compensation
Year in which shares are vested			4 years	4 years
Vesting percentage (as a percent)			25.00%	25.00%
Share Incentive Plan \| Year five \| Employee and non-employee
Share-based compensation
Year in which shares are vested			5 years	5 years
Vesting percentage (as a percent)			20.00%	20.00%
Share Incentive Plan \| Year six \| Employee and non-employee
Share-based compensation
Year in which shares are vested			6 years	6 years
Vesting percentage (as a percent)			17.00%	17.00%
Share Incentive Plan \| Year ten \| Employee and non-employee
Share-based compensation
Year in which shares are vested			10 years	10 years
Vesting percentage (as a percent)			10.00%	10.00%