Stockholder's Equity (Tables)

3 Months Ended

Mar. 31, 2020

Summary of Stock Options and SAR Activity

A summary of stock option and SAR activity for the three months ended March 31, 2020 is as follows (in millions, except share amounts which are reflected in thousands, per share amounts, and years):



	SARs Outstanding Number of SARs		Options Outstanding Number of Shares		Weighted-Average Exercise Price Per Share		Weighted-Average Remaining Contractual Life (in years)	Aggregate Intrinsic Value
As of December 31, 2019	337		34,801		$	9.79	4.75	$	746
Granted	—		1,194		11.55
Exercised	(2	)	(4,490	)	3.06
Canceled and forfeited	(24	)	(220	)	21.14
As of March 31, 2020	311		31,285		$	10.72	4.68	$	599
Vested and expected to vest as of March 31, 2020	198		25,331		$	5.41	4.31	$	585
Exercisable as of March 31, 2020	198		25,331		$	5.41	4.31	$	585

Schedule of Restricted Stock Units Activity

The following table summarizes the activity related to the Company’s RSUs for the three months ended March 31, 2020 (in thousands, except per share amounts):



	Number of Shares		Weighted-Average Grant-Date Fair Value per Share
Unvested and outstanding as of December 31, 2019	84,743		$	39.82
Granted	43,229		$	22.91
Vested	(8,949	)	$	41.49
Canceled and forfeited	(3,817	)	$	41.32
Unvested and outstanding as of March 31, 2020	115,206		$	34.03

Schedule of Stock-Based Compensation Expense by Function

The following table summarizes total stock-based compensation expense by function for the three months ended March 31, 2019 and 2020 (in millions):



	Three Months Ended March 31,
	2019		2020
Operations and support	$	1	$	25
Sales and marketing	1		14
Research and development	3		167
General and administrative	6		71
Total	$	11	$	277