Equity Awards (Tables)

3 Months Ended

Mar. 31, 2019

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

Schedule of Stock Option Activity

A summary of stock option activity for the three months ended March 31, 2019 was as follows:

	Number of Shares		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2018	1,810,580		$	46.55
Exercised	(231,558	)	21.69			$	46,348
Outstanding at March 31, 2019	1,579,022		$	50.19	5.24	$	309,955
Vested and expected to vest as of March 31, 2019	1,574,667		$	50.13	5.23	$	309,205
Vested and exercisable as of March 31, 2019	1,147,276		$	37.62	4.29	$	239,629

Schedule of Restricted Stock Unit Activity

A summary of RSU activity for the three months ended March 31, 2019 was as follows:

	Number of Shares		Weighted Average Grant Date Fair Value (Per Share)		Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2018	10,201,660		$	121.84
Granted	4,257,565		233.78
Vested	(1,939,925	)	117.30		$	445,764
Forfeited	(357,319	)	121.26
Outstanding at March 31, 2019	12,161,981		$	160.28	$	2,997,807