Employee Incentive Plans (Tables)

6 Months Ended

Jul. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Stock-based Compensation Expense by Statement of Operations Location

Stock-based compensation expense was recorded in the following cost and expense categories in the Company’s condensed consolidated statements of operations (in thousands):

	Three Months Ended July 31,				Six Months Ended July 31,
	2018		2017		2018		2017
	(unaudited)
Cost of revenue
Subscription	$	1,901	$	1,056	$	3,430	$	1,742
Professional services and other	1,083		738		1,972		1,207
Research and development	5,272		4,438		9,485		7,739
Sales and marketing	5,471		3,021		9,624		5,396
General and administrative	4,495		2,725		7,846		4,800
Total	$	18,222	$	11,978	$	32,357	$	20,884

Schedule of Shares of Common Stock Reserved for Future Issuance

Shares of common stock reserved for future issuance are as follows:

	As of
	July 31, 2018
	(unaudited)
Stock options and unvested RSUs outstanding	25,789,276
Available for future stock option and RSU grants	12,464,154
Available for ESPP	3,035,697
	41,289,127

Schedule of Stock Option Activity

A summary of the Company’s stock option activity and related information is as follows:

	Number of Options		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value (in thousands)
Outstanding as of January 31, 2018	24,917,045		$	7.37	7.6	$	550,173
Granted	684,500		39.21
Exercised	(4,025,395	)	5.23
Canceled	(677,660	)	8.41
Outstanding as of July 31, 2018 (unaudited)	20,898,490		$	8.79	7.4	$	853,892
As of July 31, 2018
Vested and exercisable (unaudited)	9,797,292		$	6.35	6.8	$	424,203

Schedule of Black-Scholes Option Pricing Model Estimated Fair Value Assumptions

The Company used the Black-Scholes option pricing model to estimate the fair value of stock options granted with the following assumptions:

	Three Months Ended July 31,		Six Months Ended July 31,
	2018	2017	2018	2017
	(unaudited)
Expected volatility	—	—	40%	40% - 41%
Expected term (in years)	—	—	6.25	6.0 - 6.4
Risk-free interest rate	—	—	2.70%	2.06% - 2.21%
Expected dividend yield	—	—	—	—

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

	Three Months Ended July 31,		Six Months Ended July 31,
	2018	2017	2018	2017
	(unaudited)
Expected volatility	39% - 40%	32% - 34%	39% - 40%	32% - 37%
Expected term (in years)	0.5 - 1.0	0.5 - 1.0	0.5 - 1.0	0.5 - 1.2
Risk-free interest rate	2.12% - 2.34%	1.12% - 1.22%	2.12% - 2.34%	0.95% - 1.22%
Expected dividend yield	—	—	—	—

Schedule of Nonvested Restricted Stock Units Activity

A summary of the Company’s RSU activity and related information is as follows:

	Number of RSUs		Weighted- Average Grant Date Fair Value Per Share
Outstanding as of January 31, 2018	2,862,929		$	24.38
Granted	2,752,588		50.67
Vested	(542,969	)	22.71
Forfeited	(181,762	)	29.39
Outstanding as of July 31, 2018 (unaudited)	4,890,786		$	39.17