Equity Incentive Plans (Tables)

9 Months Ended

Oct. 31, 2018

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

Summary of Stock Option Activity Under Equity Incentive Plans and Related Information

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, 2018	46,359,949		$	7.75	6.3	$	574,224
Options exercised	(8,249,893	)	5.26
Options forfeited/canceled	(1,360,202	)	10.04
Balance as of October 31, 2018	36,749,854		$	8.22	5.6	$	439,185
Vested and exercisable as of October 31, 2018	26,221,996		$	6.38	5.2	$	361,783

Summary of Restricted Stock Unit Activity Under 2015 Plan

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

	Number of Restricted Stock Units Outstanding		Weighted- Average Grant Date Fair Value		Aggregate Intrinsic Value (in thousands)
Unvested balance as of January 31, 2018	17,682,646		$	12.60	$	356,117
Granted	11,098,371		22.49
Vested	(6,429,146	)	12.84
Forfeited	(1,719,729	)	15.57
Converted	(1,142,838	)	11.86
Unvested balance as of October 31, 2018	19,489,304		$	17.92	$	393,270

Summary of Restricted Stock Activity Under 2015 Plan

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

	Number of Restricted Stock Units Outstanding		Weighted- Average Grant Date Fair Value		Aggregate Intrinsic Value (in thousands)
Unvested balance as of January 31, 2018	—		$	—	$	—
Granted and converted	3,330,118		19.25
Vested	(116,186	)	12.84
Unvested balance as of October 31, 2018	3,213,932		$	19.49	$	64,857

Summarizes the Components of 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   October 31,				Nine Months Ended   October 31,
	2017		2018		2017		2018
Cost of revenue—product	$	143	$	862	$	898	$	2,190
Cost of revenue—support subscription	2,422		3,327		6,441		8,940
Research and development	18,073		24,634		51,632		67,956
Sales and marketing	12,104		18,681		34,169		49,890
General and administrative	6,121		10,825		14,780		26,962
Total stock-based compensation expense	$	38,863	$	58,329	$	107,920	$	155,938