Equity Incentive Plans (Tables)

12 Months Ended

Feb. 02, 2020

Share-based Payment Arrangement [Abstract]

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

A summary of the 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 (Years)	Aggregate Intrinsic Value (in thousands)
Balance at the end of fiscal 2019	35,465,543	$	8.34	5.4	$	339,591
Options exercised	(7,770,157)	5.53
Options forfeited/canceled	(873,143)	13.91
Balance at the end of fiscal 2020	26,822,243	$	8.97	3.9	$	237,803
Vested and exercisable at the end of fiscal 2020	23,665,389	$	8.12	4.4	$	229,523

Summary of Estimate Fair Value of Employee Stock Options and Employee Purchase Plan

We estimate the fair value of employee stock options and ESPP purchase rights using a Black-Scholes option pricing model with the following assumptions:

	Fiscal Year Ended
	2018		2019	2020
Employee Stock Options
Expected term (in years)	6.1		n/a	n/a
Expected volatility	47	%	n/a	n/a
Risk-free interest rate	1.9	%	n/a	n/a
Dividend rate	—		n/a	n/a
Fair value of common stock	$12.84		n/a	n/a
Employee Stock Purchase Plan
Expected term (in years)	0.5 - 2.0		0.5 - 2.0	0.5 - 2.0
Expected volatility	35% - 39%		44% - 47%	42% - 47%
Risk-free interest rate	0.9% - 1.4%		2% - 2.8%	1.7% - 2.5%
Dividend rate	—		—	—
Fair value of common stock	$10.39 - $14.65		$20.62 - $27.66	$17.76 - $20.87

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

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 at the end of fiscal 2019	21,917,550	$	17.94	$	392,515
Granted	15,780,796	18.91
Vested	(9,241,583)	17.12
Forfeited	(3,022,166)	18.93
Unvested balance at the end of fiscal 2020	25,434,597	$	18.72	$	452,736

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 at the end of fiscal 2019	2,267,569	$	18.70	$	40,612
Granted	1,399,688	20.30
Vested	(1,284,638)	18.97
Forfeited/canceled	(255,413)	19.93
Unvested balance at the end of fiscal 2020	2,127,206	$	19.58	$	37,864

Summarizes the Components of Stock-Based Compensation

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

	Fiscal Year Ended
	2018		2019		2020
Cost of revenue—product	$	1,630	$	2,951	$	3,732
Cost of revenue—subscription services	9,050		12,378		14,403
Research and development	71,229		92,484		107,658
Sales and marketing	47,687		66,350		67,560
General and administrative	21,077		36,482		33,352
Total stock-based compensation expense	$	150,673	$	210,645	$	226,705