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Stock-Based Compensation (Tables)

3 Months Ended

Apr. 30, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Option Activity Under Equity Incentive Plans and Related Information

The following table summarizes the stock option activity under the equity incentive plans and related information:

		Shares Subject to Options Outstanding								Weighted- Average
						Weighted-				Remaining
						Average Exercise				Contractual Life				Aggregate
		Shares				Price				(Years)				Intrinsic Value
														(in thousands)
Balance as of January 31, 2020			8,772,585			$	9.48				4.27			$	60,221
Options granted			31,666				12.48
Options exercised			(222,426	)			4.34
Options forfeited/cancelled			(24,250	)			17.85
Balance as of April 30, 2020			8,557,575			$	9.60				4.08			$	64,061
Vested and expected to vest as of April 30, 2020			8,484,725			$	9.52				4.05			$	64,056
Exercisable as of April 30, 2020			7,036,704			$	7.44				3.19			$	63,949

Summary of Restricted Stock Unit Activity Under Equity Incentive Plans and Related Information

The following table summarizes the restricted stock unit activity under the equity incentive plans and related information:

		Number of				Weighted-
		Restricted				Average
		Stock Units				Grant Date
		Outstanding				Fair Value
Unvested balance - January 31, 2020			21,808,107			$	18.85
Granted			7,313,474				14.53
Vested, net of shares withheld for employee payroll taxes			(1,330,535	)			18.66
Forfeited/cancelled			(884,977	)			19.78
Unvested balance - April 30, 2020			26,906,069			$	17.65

Summary of Components of Stock-Based Compensation Expense

The following table summarizes the components of stock-based compensation expense recognized in the condensed consolidated statements of operations (in thousands):

		Three Months Ended
		April 30,
		2020				2019
Cost of revenue		$	4,541			$	3,611
Research and development			17,287				12,975
Sales and marketing			10,079				9,400
General and administrative			8,136				6,376
Total stock-based compensation		$	40,043			$	32,362

Schedule Of Share Based Payment Award Employee Stock Options And Employee Stock Purchase Plan Valuation Assumptions [Table Text Block]

We estimated the fair value of employee stock options and 2015 ESPP purchase rights using a Black-Scholes option pricing model with the following assumptions.

		Three Months Ended
		April 30,
		2020								2019
Employee Stock Options
Expected term (in years)							5.8							N/A
Risk-free interest rate							0.6	%						N/A
Volatility							46	%						N/A
Dividend yield							0	%						N/A
Employee Stock Purchase Plan
Expected term (in years)			0.5		-		2.0				0.5		-		2.0
Risk-free interest rate			0.3	%	-		0.4	%			2.4	%	-		2.5	%
Volatility			44	%	-		52	%			46	%	-		55	%
Dividend yield							0	%							0	%

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Schedule of share based payment award employee stock options and employee stock purchase plan valuation assumptions .

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
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Tabular disclosure of the changes in outstanding nonvested restricted stock units.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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