Stock-Based Compensation and Stockholder’s Equity (Tables)

3 Months Ended

Mar. 31, 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 three months ended March 31, 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)		352,869
Vested		(352,584	)
Unvested outstanding as of March 31, 2019		1,283,657		$		32.19

(1) Included are 30,135 RSUs granted to non-employee members of the Board of Directors during the three months ended March 31, 2019.