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Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Share-Based Compensation

Share Based Compensation Expense by Type of Award

The following table presents the Company’s share-based compensation expense by type of award:

​

​	​	​	​	​	​	​	​	​
​		Years Ended December 31,
​		2017		2018		2019		2019
​	​	RMB	​	RMB	​	RMB	​	US$
Share options	​	51,054	​	45,973	​	40,533	​	5,822
Non-vested restricted shares	​	42,581	​	66,790	​	54,364	​	7,809
Total share-based compensation	​	93,635	​	112,763	​	94,897	​	13,631

​

Black Scholes Pricing Model Assumptions used to Estimate Fair Value of Options Granted

The Group uses the Black-Scholes pricing model and the following assumptions to estimate the fair value of the options granted or modified:

​

​	​	​	​	​	​
​		2017		2018
Average risk-free rate of return		1.93	%	2.78	%
Weighted average expected option life		6.1	years	6.1	years
Estimated volatility		68.8	%	57.6	%
Average dividend yield		Nil		Nil

​

​

Summary of Stock Option Activity

The following table summarizes option activity during the year ended December 31, 2019:

​

​	​	​	​	​	​	​	​	​
​		​		​		Weighted		​
​	​	​	​	Weighted	​	Average	​	Aggregate
​	​	​	​	Average	​	Remaining	​	Intrinsic
​	​	Number of	​	Exercise	​	Contractual	​	Value of
​	​	options	​	Price	​	Term	​	Options
​		​		RMB		​		RMB
Outstanding as of January 1, 2019	​	571,474	​	343.14	​	7.0	​	34,344
Granted	​	—	​	—	​	​	​	​
Exercised	​	(152,410)	​	208.36	​	​	​	​
Forfeited	​	(32,359)	​	312.85	​	​	​	​
Outstanding as of December 31, 2019	​	386,705	​	398.80	​	6.3	​	6,455
Exercisable as of December 31, 2019	​	272,521	​	390.15	​	7.2	​	—

Summary of Non Vested Restricted Share Activity

A summary of non-vested restricted share activity during the year ended December 31, 2019 is presented below:

​

​	​	​	​	​
​		​		Weighted-
​		Number of		average
​		non-vested		grant-
​		restricted		date fair
Non-vested restricted shares	​	shares		value
​	​	​		RMB
Non-vested as of January 1, 2019		370,613	​	483.29
Granted		37,566	​	418.16
Vested		(124,592)	​	506.02
Forfeited		(109,963)	​	543.68
Non-vested as of December 31, 2019		173,624	​	427.59

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