Employee Incentive Plans (Tables)

9 Months Ended

Oct. 31, 2017

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

Schedule of Stock-based Compensation Expense by Award Type

Stock-based compensation expense by award type was as follows (in thousands):

	Three Months Ended October 31,				Nine Months Ended October 31,
	2017		2016		2017		2016
Stock options	$	6,162	$	4,836	$	18,313	$	11,869
RSUs	3,587		—		5,088		—
ESPP	2,146		—		4,946		—
Restricted stock awards	880		—		2,400		—
Restricted common stock	1,633		—		4,545		—
Total	$	14,408	$	4,836	$	35,292	$	11,869

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,
	2017		2016		2017		2016
Cost of revenue
Subscription	$	1,421	$	578	$	3,163	$	1,417
Professional services and other	979		304		2,186		890
Research and development	5,174		808		12,913		2,162
Sales and marketing	3,894		1,619		9,290		4,385
General and administrative	2,940		1,527		7,740		3,015
Total	$	14,408	$	4,836	$	35,292	$	11,869

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, 2017	32,866,862		$	6.01	8.2	$	145,570
Granted	2,661,568		11.48
Exercised	(7,205,213	)	3.58
Canceled	(1,205,559	)	7.67
Outstanding as of October 31, 2017	27,117,658		$	7.12	7.9	$	591,162
As of October 31, 2017
Vested and exercisable	10,699,293		$	4.86	6.9	$	257,446

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 October 31,		Nine Months Ended October 31,
	2017	2016	2017	2016
	(unaudited)
Expected volatility	41.4%	40.9%-41.6%	40.4%-41.4%	40.9%-44.3%
Expected term (in years)	6.3	5.8-6.1	6.3-6.4	5.8-6.4
Risk-free interest rate	1.87%	1.22%-1.42%	1.87%-2.21%	1.13%-1.54%
Expected dividend yield	—	—	—	—

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

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, 2017	—		$	—
Granted	2,567,667		24.08
Vested	—		—
Forfeited	(61,451	)	23.68
Outstanding as of October 31, 2017	2,506,216		$	24.08

Schedule of ESPP 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:

		Nine Months Ended October 31,
		2017
	(unaudited)
Expected volatility		31.8%-37.4%
Expected term (in years)		0.5-1.2
Risk-free interest rate		0.95%-1.22%
Expected dividend yield		—