Stock-Based Compensation (Tables)

12 Months Ended

Jan. 31, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

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

The following table summarizes the stock option activity under the equity incentive plans and related information:

	Shares Subject to Options Outstanding					Weighted- Average
				Weighted-		Remaining
				Average Exercise		Contractual Life		Aggregate
	Shares			Price		(Years)		Intrinsic Value
								(in thousands)
Balance as of January 31, 2019		9,096,961		$	9.01		4.97	$	108,731
Options granted		577,082			19.89
Option exercised		(659,348	)		9.05
Options forfeited/cancelled		(242,110	)		17.63
Balance as of January 31, 2020		8,772,585		$	9.48		4.27	$	60,221
Options granted		31,666			12.48
Option exercised		(1,994,667	)		5.14
Options forfeited/cancelled		(192,547	)		10.73
Balance as of January 31, 2021		6,617,037		$	10.77		3.77	$	48,098
Vested and expected to vest as of January 31, 2021		6,554,892		$	10.68		3.74	$	48,092
Exercisable as of January 31, 2021		5,348,780		$	8.59		2.87	$	47,974

Shares Subject to Options Outstanding Weighted-Average Weighted-Remaining Average Exercise Contractual Life Aggregate Shares Price (Years) Intrinsic Value (in thousands) Balance as of January 31, 2019 Options granted Option exercised Options forfeited/cancelled Balance as of January 31, 2020 Options granted Option exercised Options forfeited/cancelled Balance as of January 31, 2021 Vested and expected to vest as of January 31, 2021 Exercisable as of January 31, 2021 9,096,961 $9.01 4.97 $ 108,731 577,082 19.89 (659,34) 9.05 (242,110) 17.63  8,772,585 $ 9.48 4.27 $ 60,221 31,666 12.48  (1,994,667) 5.14  (192,547) 10.73 6,617,037  $ 10.773.77 $ 48,098 6,554,892 $ 10.68 3.74 $ 48,092 5,348,780 $ 8.59 2.87 $ 47,974

Summary of Restricted Stock Unit Activity Under Equity Incentive Plans and Related Information

The following table summarizes the restricted stock unit activity under the equity incentive plans and related information:

	Number of			Weighted-
	Restricted			Average
	Stock Units			Grant Date
	Outstanding			Fair Value
Unvested balance - January 31, 2019		18,098,707		$	19.35
Granted		12,436,586			18.81
Vested, net of shares withheld for employee payroll taxes		(4,166,907	)		19.92
Forfeited/cancelled		(4,560,279	)		19.77
Unvested balance - January 31, 2020		21,808,107		$	18.85
Granted		10,702,574			15.81
Vested, net of shares withheld for employee payroll taxes		(5,100,239	)		18.27
Forfeited/cancelled		(13,079,764	)		17.87
Unvested balance - January 31, 2021		14,330,678		$	17.68

er of  Weighted-  Restricted  Average  Stock Units  Grant Date  Outstanding  Fair Value  Unvested balance - January 31, 2019  18,098,707  $  19.35  Granted  12,436,586  18.81  Vested, net of shares withheld for employee payroll taxes  (4,166,907  )  19.92  Forfeited/cancelled  (4,560,279  )  19.77  Unvested balance - January 31, 2020  21,808,107  $  18.85  Granted  10,702,574  15.82  Vested, net of shares withheld for employee payroll taxes  (5,100,239  )  18.28  Forfeited/cancelled  (13,079,764  )  17.87  Unvested balance - January 31, 2021  14,330,678  $  17.68  

Summary of Components of Stock-Based Compensation Expense

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

	Year Ended January 31,
	2021		2020		2019
Cost of revenue	$	18,936	$	16,769	$	14,065
Research and development		61,145		62,565		45,189
Sales and marketing		42,015		38,030		36,864
General and administrative		32,196		28,624		23,178
Total stock-based compensation	$	154,292	$	145,988	$	119,296

Summary of Estimated Fair Value of Employee Stock Options and 2015 ESPP

We estimated the fair value of employee stock options and 2015 ESPP purchase rights using a Black-Scholes option pricing model with the following assumptions:

	Year Ended January 31,
	2021						2020						2019
Employee Stock Options
Expected term (in years)					5.8			5.5		–	5.8			5.5		–	5.8
Risk-free interest rate					0.6	%					1.8	%		2.8	%	–	3.1	%
Volatility					46	%					45	%					45	%
Dividend yield					0	%					0	%					0	%
Employee Stock Purchase Plan
Expected term (in years)		0.5		–	2.0			0.5		–	2.0			0.5		–	2.0
Risk-free interest rate		0.1	%	–	0.4	%		1.7	%	–	2.5	%		2.0	%	–	2.8	%
Volatility		44	%	–	54	%		34	%	–	55	%		37	%	–	50	%
Dividend yield					0	%					0	%					0	%

Year Ended January 31,  2021  2020  2019  Employee Stock Options  Expected term (in years)  5.8  5.5  –  5.8  5.5  –  5.8  Risk-free interest rate  0.6%  1.8%  2.8%  –  3.1%  Volatility  46%  45%  45%  Dividend yield  0%  0%  0%  Employee Stock Purchase Plan  Expected term (in years)  0.5  –  2.0  0.5  –  2.0  0.5  –  2.0  Risk-free interest rate  0.1%  –  0.4%  1.7%  –  2.5%  2.0%  –  2.8%  Volatility  44%  –  54%  34%  –  55%  37%  –  50%  Dividend yield  0%  0%  0%