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Stock-Based Compensation and Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2019
Share Based Compensation [Abstract]  
Schedule of Share-based Compensation, Restricted Stock Units Activity

A summary of the restricted stock unit (RSU) activity for the nine months ended September 30, 2019 is presented in the following table:

 

 

 

 

 

Restricted Stock Units

 

 

 

 

 

Units

 

 

 

Weighted-

Average Grant

Date

Fair Value

 

 

 

 

 

 

 

 

 

 

(in millions)

 

 

Unvested outstanding as of December 31, 2018

 

 

 

1,283,372

 

 

$

 

23.93

 

 

Granted (1)

 

 

 

457,941

 

 

 

 

45.23

 

 

Vested

 

 

 

(520,183

)

 

 

 

18.69

 

 

Forfeited

 

 

 

(19,453

)

 

 

 

23.79

 

 

Unvested outstanding as of September 30, 2019

 

 

 

1,201,677

 

 

$

 

34.26

 

 

 

 

(1)

Included are 30,135 RSUs granted to non-employee members of the Board of Directors during the nine months ended September 30, 2019.