Stock-Based Compensation (Tables)

3 Months Ended

Apr. 30, 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, 2021		6,617,037		$	10.77		3.77	$	48,098
Options granted		—			—
Options exercised		(175,460	)		7.73
Options forfeited/cancelled		—			—
Balance as of April 30, 2021		6,441,577		$	10.85		3.55	$	67,482
Vested and expected to vest as of April 30, 2021		6,381,107		$	10.76		3.52	$	67,406
Exercisable as of April 30, 2021		5,224,876		$	8.71		2.66	$	65,940

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, 2021		14,330,678		$	17.68
Granted		7,003,448			23.65
Vested, net of shares withheld for employee payroll taxes		(1,206,102	)		19.75
Forfeited/cancelled, including shares withheld for employee payroll taxes		(1,915,467	)		18.46
Unvested balance - April 30, 2021		18,212,557		$	19.75

Summary of Components of Stock-Based Compensation Expense

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

	Three Months Ended
	April 30,
	2021		2020
Cost of revenue	$	5,340	$	4,541
Research and development		15,453		17,287
Sales and marketing		11,551		10,079
General and administrative		9,446		8,136
Total stock-based compensation	$	41,790	$	40,043

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.

	Three Months Ended
	April 30,
	2021					2020
Employee Stock Options
Expected term (in years)				N/A						5.8
Risk-free interest rate				N/A						0.6	%
Volatility				N/A						46	%
Dividend yield				N/A						0	%
Employee Stock Purchase Plan
Expected term (in years)		0.5	-		2.0		0.5		-	2.0
Risk-free interest rate	0.1%		-	0.2%			0.3	%	-	0.4	%
Volatility	42%		-	52%			44	%	-	52	%
Dividend yield				0%						0	%