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SHARE-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2020

SHARE-BASED COMPENSATION

Summary of the option activity

​

​	​	​	​	​	​	​
​		​		​		Weighted
​	​	​	​	​	​	average
​	​	​	​	Weighted	​	grant-date
​	​	Number	​	average	​	fair value
​		of options		exercise price		per option
​				(RMB)		(RMB)
Options outstanding at January 1, 2018		28,087,236		5.1		3.2
Granted		500,000		5.0		31.2
Exercised	​	(3,614,464)		5.2		4.5
Forfeited	​	(193,340)	​	5.0	​	6.2
​	​	​	​	​	​	​
Options outstanding at December 31, 2018		24,779,432		5.3		2.2
Granted		—		​		​
Exercised	​	(10,150,336)	​	5.6	​	3.5
Forfeited		—		​		​
​	​	​	​	​	​	​
Options outstanding at December 31, 2019		14,629,096		5.4		1.7
Granted	​	—	​	​	​	​
Exercised	​	(14,222,096)	​	5.5	​	1.6
Forfeited	​	—	​	​	​	​
​	​	​	​	​	​	​
Options outstanding at December 31, 2020	​	407,000	​	5.1	​	1.6
​	​	​	​	​	​	​
Options vested and expected to be vested at December 31, 2020		407,000		5.1	​	1.6

​

Summary of information with respect to stock options outstanding and stock options exercisable

​

​	​	​	​	​	​	​
​	​	​	​	Weighted	​	​
​	​	​	​	average	​	Weighted
​	​	Number		remaining		average
​		of shares		contractual life		exercise price
​	​	​		(years)		(RMB)
Options outstanding and exercisable	​	407,000	​	0.3	​	5.1

Summary of the restricted share activity

​

​	​	​	​	​
​	​	​	​	Weighted average grant-
​	​	Number of	​	date fair value per share
​		Shares		(RMB)
​	​	​		​
Unvested at January 1, 2018	​	24,525,620	​	5.3
Granted	​	13,202,512	​	14.5
Vested	​	(7,326,620)	​	6.0
Forfeited	​	(891,008)	​	5.9
​	​	​	​	​
Unvested at December 31, 2018		29,510,504	​	9.3
Granted		14,551,472	​	34.2
Vested		(9,122,432)	​	9.3
Forfeited		(1,582,248)	​	10.7
​	​	​	​	​
Unvested at December 31, 2019	​	33,357,296	​	22.4
Granted	​	11,710,848	​	66.7
Vested	​	(12,684,640)	​	14.1
Forfeited	​	(1,364,736)	​	25.1
​	​	​	​	​
Unvested at December 31, 2020		31,018,768	​	42.4

​

Assumptions used to estimate fair value of restricted shares granted

​

​	​	​	​	​	​	​	​
Grant date:		August 2018		August 2019		August 2020	​
Risk-free rate of return		2.047% - 2.418	%	1.67% - 1.88	%	0.14% - 0.19	%
Volatility		71.85	%	63.22	%	59.23	%
Expected dividend yield		0.00	%	0.00	%	0.00	%
Share price at grant date		US$3.125	​	US$5.02375	​	US$10.1475	​
​		(RMB21.3)	​	(RMB34.6)	​	(RMB70.5)	​
Expected term		1 – 3 years	​	1 – 3 years	​	1 – 3 years	​

Summary of share-based compensation expenses

​

​	​	​	​	​	​	​
​	​	Years ended December 31,
​		2018		2019		2020
​	​	​	​	​	​	​
Costs of revenue		18,008		46,007	​	89,943
Selling and marketing expenses		25,213		39,436	​	54,204
General and administrative expenses		61,707		101,949	​	184,943
Research and development expenses	​	949	​	2,364	​	4,596
Total share-based compensation expenses		105,877		189,756	​	333,686

X

- Definition

Tabular disclosure of the significant assumptions used during the year to estimate the fair value of restricted shares, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding and exercisable options that are fully vested and expected to vest. 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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