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Equity Incentive Plans - (Tables)

6 Months Ended

Jul. 31, 2019

Share-based Payment Arrangement [Abstract]

A summary of stock option activity under our equity incentive plans and related information is as follows:



	Options Outstanding
	Number of Shares		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (In Years)	Aggregate Intrinsic Value (in thousands)
Balance as of January 31, 2019	35,465,543		$	8.34	5.4	$	339,591
Options exercised	(3,862,965	)	4.99
Options forfeited/canceled	(343,662	)	15.49
Balance as of July 31, 2019	31,258,916		$	8.67	3.9	$	218,450
Vested and exercisable as of July 31, 2019	25,407,263		$	7.54	4.8	$	203,215

Restricted Stock Units

A summary of the RSU activity under our 2015 Plan and related information is as follows:



	Number of RSUs Outstanding		Weighted- Average Grant Date Fair Value		Aggregate Intrinsic Value (in thousands)
Unvested balance as of January 31, 2019	21,917,550		$	17.94	$	392,515
Granted	8,792,982		19.81
Vested	(4,352,885	)	16.38
Forfeited	(1,324,694	)	18.47
Unvested balance as of July 31, 2019	25,032,953		$	18.84	$	378,999

Restricted Stock

A summary of the restricted stock activity under our 2015 Plan and related information is as follows:



	Number of Restricted Stock Outstanding		Weighted- Average Grant Date Fair Value		Aggregate Intrinsic Value (in thousands)
Unvested balance as of January 31, 2019	2,267,569		$	18.70	$	40,612
Granted	1,399,688		20.30
Vested	(843,321	)	19.85
Unvested balance as of July 31, 2019	2,823,936		$	19.25	$	42,754

Stock-Based Compensation

The following table summarizes the components of stock-based compensation expense recognized in the condensed consolidated statements of operations (in thousands):



	Three Months Ended July 31,				Six Months Ended July 31,
	2018		2019		2018		2019
Cost of revenue—product	$	720	$	954	$	1,328	$	1,931
Cost of revenue—support subscription	2,929		3,633		5,613		7,584
Research and development	22,232		29,108		43,322		57,353
Sales and marketing	17,269		16,055		31,209		34,369
General and administrative	10,504		8,654		16,137		19,324
Total stock-based compensation expense	$	53,654	$	58,404	$	97,609	$	120,561