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Stock-based Compensation (Tables)
9 Months Ended
Sep. 30, 2017
Summary of Activities for Restricted Stock Awards ("RSAs") and Restricted Stock Units ("RSUs")

The following table summarizes the activities for restricted stock awards (“RSAs”) and restricted stock units (“RSUs”) for the nine months ended September 30, 2017:

 

 

Shares of restricted stock outstanding

 

 

Weighted-average grant date fair value

 

Balance as of December 31, 2016

 

 

586,224

 

 

$

17.00

 

Granted

 

 

884,081

 

 

 

26.60

 

Vested

 

 

(96,711

)

 

 

17.00

 

Forfeited

 

 

(126,523

)

 

 

23.27

 

Balance as of September 30, 2017

 

 

1,247,071

 

 

$

23.17

 

 

Service-based Vesting Options  
Summary of Stock Option Activity and Related Information

The following table summarizes the activity for options that vest solely based upon the satisfaction of a service condition for the nine months ended September 30, 2017:

 

 

 

Options

outstanding

 

 

Weighted-average exercise price

 

 

Weighted-average remaining

contractual life

(in years)

 

 

Aggregate intrinsic

values

(in thousands)

 

Balance as of December 31, 2016

 

 

3,168,967

 

 

$

8.55

 

 

 

 

 

 

 

 

 

Granted

 

 

205,300

 

 

 

26.53

 

 

 

 

 

 

 

 

 

Exercised

 

 

(379,214

)

 

 

1.94

 

 

 

 

 

 

 

 

 

Forfeited

 

 

(141,331

)

 

 

17.58

 

 

 

 

 

 

 

 

 

Balance as of September 30, 2017

 

 

2,853,722

 

 

$

10.28

 

 

 

8.13

 

 

$

35,748

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Exercisable, September 30, 2017

 

 

1,098,328

 

 

$

4.67

 

 

 

6.94

 

 

$

19,637

 

 

Performance-based and Market-based Vesting Options  
Summary of Stock Option Activity and Related Information

The following table summarizes the activity for options that vest based upon the satisfaction of performance or market conditions for the nine months ended September 30, 2017:

 

 

 

Options

outstanding

 

 

Weighted-average exercise price

 

 

Weighted-average remaining

contractual life

(in years)

 

 

Aggregate intrinsic

values

(in thousands)

 

Balance as of December 31, 2016

 

 

3,836,107

 

 

$

2.46

 

 

 

 

 

 

 

 

 

Granted

 

 

463,200

 

 

 

27.02

 

 

 

 

 

 

 

 

 

Exercised

 

 

(1,711,381

)

 

 

2.71

 

 

 

 

 

 

 

 

 

Forfeited

 

 

(43,350

)

 

 

27.29

 

 

 

 

 

 

 

 

 

Balance as of September 30, 2017

 

 

2,544,576

 

 

$

6.33

 

 

 

7.56

 

 

$

43,083