Convertible Preferred Stock, Stockholders’ Equity (Deficit) and Equity Incentive Plan (Tables)

9 Months Ended

Oct. 31, 2019

Stockholders' Equity Note [Abstract]

Summary of Stock Option Activity Under Equity Incentive Plan

A summary of stock option activity under our equity incentive plan and related information is as follows:

	Stock Options
	Outstanding Stock Options	Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value
	(in thousands, except share, life, and per share data)
Outstanding as of January 31, 2019	35,064,465	$	1.48	6.8	$	534,572
Granted	1,576,150	36.86
Exercised	(17,012,350)	0.34
Canceled/forfeited/expired	(401,440)	6.28
Outstanding as of October 31, 2019	19,226,825	$	5.28	7.9	$	1,249,643
Vested as of October 31, 2019	7,722,322	$	1.29	7.0	$	530,701

Summary of Restricted Stock Units (RSUs) Activity Under Equity Incentive Plan

A summary of RSU activity under our equity incentive plan and related information is as follows:

	RSUs
	Unvested RSUs	Weighted- Average Grant Date Fair Value Per Share
Unvested as of January 31, 2019	—	$	—
Granted	1,699,579	81.45
Canceled/forfeited	(16,019)	88.40
Unvested as of October 31, 2019	1,683,560	$	81.38

Summary of Assumptions for Estimating Fair Value of ESPP Purchase Rights

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

	Nine Months Ended October 31, 2019
Expected volatility	40.3% - 56.2%
Expected term (years)	0.5 - 2.1
Risk-free interest rate	1.8% - 2.5%
Expected dividend yield	—

Summary of Stock-based Compensation Expense by Line Item

The stock-based compensation expense by line item in the accompanying condensed consolidated statements of operations is summarized as follows:

	Three Months Ended October 31,				Nine Months Ended October 31,
	2019		2018		2019		2018
	(in thousands)
Cost of revenue	$	2,369	$	317	$	5,101	$	542
Research and development	3,642		383		7,316		705
Sales and marketing	12,488		1,154		25,554		2,042
General and administrative	3,296		798		8,561		1,338
Total stock-based compensation expense	$	21,795	$	2,652	$	46,532	$	4,627