Employee Incentive Plans (Tables)

9 Months Ended

Oct. 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 October 31,				Nine Months Ended October 31,
	2018		2017		2018		2017
	(unaudited)
Cost of revenue
Subscription	$	2,383	$	1,421	$	5,813	$	3,163
Professional services and other	1,305		979		3,277		2,186
Research and development	6,291		5,174		15,776		12,913
Sales and marketing	6,228		3,894		15,852		9,290
General and administrative	5,335		2,940		13,181		7,740
Total	$	21,542	$	14,408	$	53,899	$	35,292

Schedule of Shares of Common Stock Reserved for Future Issuance

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

	As of
	October 31, 2018
	(unaudited)
Stock options and unvested RSUs outstanding	24,250,317
Available for future stock option and RSU grants	12,651,706
Available for ESPP	3,035,697
	39,937,720

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	(5,184,832	)	5.51
Canceled	(1,102,379	)	8.53
Outstanding as of October 31, 2018 (unaudited)	19,314,334		$	8.93	7.2	$	954,692
As of October 31, 2018
Vested and exercisable (unaudited)	9,897,397		$	6.54	6.7	$	512,889

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

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

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

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 October 31,		Nine Months Ended October 31,
	2018	2017	2018	2017
	(unaudited)
Expected volatility	—	41%	40%	40% - 41%
Expected term (in years)	—	6.3	6.3	6.3 - 6.4
Risk-free interest rate	—	1.87%	2.70%	1.87% - 2.21%
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	3,133,189		53.27
Vested	(741,253	)	23.56
Forfeited	(318,882	)	33.28
Outstanding as of October 31, 2018 (unaudited)	4,935,983		$	42.27