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Stock-based Compensation (Tables)

3 Months Ended

Apr. 30, 2023

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Classification of Stock-based Compensation

The following table presents the classification of stock-based compensation for the periods indicated:

		Three Months Ended April 30,
		2023				2022
		(in thousands)
Stock-based compensation:
Cost of revenue		$	941			$	349
Research and development			18,361				17,151
Selling, general and administrative			7,963				9,541
Total stock-based compensation		$	27,265			$	27,041

Weighted-Average Assumptions Used to Estimate Fair Value

The following table sets forth the weighted-average assumptions used to estimate the fair value of employee stock purchase plan awards for the periods indicated:

		Three Months Ended April 30,
		2023				2022
Employee stock purchase plan awards:
Volatility			59	%			89	%
Risk-free interest rate			4.73	%			0.86	%
Expected term (years)		0.5				0.5
Dividend yield			0	%			0	%

Stock Option Activities

The following table summarizes stock option activities for the period indicated:

		Option Outstanding
																Weighted-
												Total Intrinsic				Average
										Weighted-		Value Of				Remaining				Aggregate
						Weighted-				Average		Options				Contractual				Intrinsic
						Average				Grant-date		Exercised				Term				Value
		Shares				Exercise Price				Fair Value		(in thousands)				(in years)				(in thousands)
Outstanding at January 31, 2023			484,791			$	42.18
Exercised			(28,334	)			23.02					$	1,758
Forfeited			(648	)			41.49
Outstanding at April 30, 2023			455,809				43.37										4.20			$	17,106
Exercisable at April 30, 2023			361,063			$	45.54										3.50			$	12,700

Restricted Stock Unit Activities

The following table summarizes restricted stock unit activities for the period indicated:

						Weighted-
						Average
						Grant-Date
		Shares				Fair Value
Unvested at January 31, 2023			2,573,359			$	86.81
Granted			419,517				88.91
Vested			(439,662	)			75.89
Forfeited			(63,023	)			67.28
Unvested at April 30, 2023			2,490,191			$	89.59

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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-SubTopic 10
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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.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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