Equity Awards (Tables)

12 Months Ended

Dec. 31, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Information About Outstanding And Vested Stock Options

A summary of stock option activity was as follows:

	Number of Shares		Weighted- Average Exercise Price Per Share		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value
	(in thousands)				(in years)	(in thousands)
Outstanding at December 31, 2017	3,370		$	38.43
Exercised	(1,462	)	$	26.23		$	204,337
Canceled	(97	)	$	70.52
Outstanding at December 31, 2018	1,811		$	46.55
Granted	161		$	266.31
Exercised	(640	)	$	34.61		$	138,389
Canceled	(178	)	$	86.02
Outstanding at December 31, 2019	1,154		$	77.70	5.1	$	236,055
Vested and expected to vest as of December 31, 2019	1,119		$	72.37	5.0	$	234,889
Vested and exercisable as of December 31, 2019	907		$	43.75	4.1	$	216,458

Restricted Stock Unit Table

A summary of RSU activity was as follows:

	Number of Shares		Weighted-Average Grant-Date Fair Value Per Share		Aggregate Intrinsic Value
	(in thousands)				(in thousands)
Outstanding at December 31, 2017	11,403		$	81.50
Granted	5,303		$	160.08
Vested	(5,486	)	$	77.38	$	931,848
Forfeited	(1,018	)	$	100.55
Outstanding at December 31, 2018	10,202		$	121.84
Granted	5,338		$	240.32
Vested	(5,487	)	$	126.85	$	1,369,918
Forfeited	(1,320	)	$	145.34
Outstanding at December 31, 2019	8,733		$	185.39	$	2,465,387
Expected to vest as of December 31, 2019	7,506				$	2,119,197