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Employee Incentive Plans (Tables)

12 Months Ended

Jan. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Stock-based Compensation Expense by Award Type

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

	Year Ended January 31,
	2020				2019				2018
Stock options	$	21,888			$	23,466			$	24,186
RSUs	94,637				41,637				9,104
ESPP	9,408				7,248				7,111
Restricted stock awards	590				1,608				3,281
Restricted common stock	101				2,361				6,178
Total	$	126,624			$	76,320			$	49,860

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 consolidated statements of operations (in thousands):  

	Year Ended January 31,
	2020				2019				2018
Cost of revenue:
Subscription	$	12,923			$	7,837			$	4,600
Professional services and other	7,164				4,983				3,137
Research and development	37,683				22,642				18,107
Sales and marketing	38,077				22,916				13,242
General and administrative	30,777				17,942				10,774
Total	$	126,624			$	76,320			$	49,860

Schedule of Stock Option Activity

A summary of the Company’s stock option activity and related information was 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, 2019	17,803,794			$	9.16			7.1		$	1,304,446
Granted	415,547			82.33
Exercised	(5,422,281	)		8.37
Canceled	(437,758	)		13.35
Outstanding as of January 31, 2020	12,359,302			$	11.82			6.2		$	1,436,487
As of January 31, 2020:
Vested and expected to vest	12,359,302			$	11.82			6.2		$	1,436,487
Vested and exercisable	8,723,638			$	8.16			5.9		$	1,045,852

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:  

	Year Ended January 31,
	2020			2019			2018
Expected volatility	43	%		40	%		40% - 41%
Expected term (in years)	6.3			6.3			6.3 - 6.4
Risk-free interest rate	1.55% - 2.27%			2.70	%		1.87% - 2.21%
Expected dividend yield	—			—			—

Schedule of Nonvested Restricted Stock Units Activity

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

	Number of RSUs			Weighted- Average Grant Date Fair Value Per Share
Outstanding as of January 31, 2019	4,835,536			$	44.49
Granted	2,458,095			114.07
Vested	(1,752,333	)		44.69
Forfeited	(648,057	)		54.94
Outstanding as of January 31, 2020	4,893,241			$	77.99

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:

		Year Ended January 31,
		2020		2019		2018
Expected volatility		43% - 59%		39% - 70%		32% - 38%
Expected term (in years)		0.5 - 1.0		0.5 - 1.0		0.5 - 1.2
Risk-free interest rate		1.53% - 2.05%		2.12% - 2.62%		0.95% - 1.73%
Expected dividend yield		—		—		—

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Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit.

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