Equity Incentive Plans (Tables)

6 Months Ended

Jul. 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	(5,884,173	)	4.94
Options forfeited/canceled	(1,191,720	)	9.36
Balance as of July 31, 2018	39,284,056		$	8.12	5.9	$	531,664
Vested and exercisable as of July 31, 2018	26,675,832		$	6.00	5.4	$	417,651

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	7,751,921		20.79
Vested	(4,117,282	)	12.50
Forfeited	(858,561	)	14.18
Converted	(1,142,838	)	11.86
Unvested balance as of July 31, 2018	19,315,886		$	15.87	$	418,359

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 July 31,				Six Months Ended July 31,
	2017		2018		2017		2018
Cost of revenue—product	$	358	$	720	$	755	$	1,328
Cost of revenue—support subscription	2,245		2,929		4,019		5,613
Research and development	17,971		22,232		33,559		43,322
Sales and marketing	11,439		17,269		22,065		31,209
General and administrative	4,825		10,504		8,659		16,137
Total stock-based compensation expense	$	36,838	$	53,654	$	69,057	$	97,609