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Stock-based Compensation (Tables)

6 Months Ended

Jul. 31, 2025

Share-Based Payment Arrangement [Abstract]

Classification of Stock-based Compensation

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

		Three Months Ended July 31,								Six Months Ended July 31,
		2025				2024				2025				2024
		(in thousands)
Stock-based compensation:
Cost of revenue		$	780			$	833			$	1,731			$	1,440
Research and development			16,972				18,395				34,557				36,016
Selling, general and administrative			7,436				8,384				15,030				16,192
Total stock-based compensation		$	25,188			$	27,612			$	51,318			$	53,648

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 July 31,								Six Months Ended July 31,
		2025				2024				2025				2024
Employee stock purchase plan awards:
Volatility			—				—				54	%			39	%
Risk-free interest rate			—				—				4.29	%			5.38	%
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:

		Options 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, 2025			226,616			$	52.20
Exercised			(17,284	)			42.97					$	440
Expired			(9,119	)			76.52
Outstanding at July 31, 2025			200,213				51.89										2.65			$	3,417
Exercisable at July 31, 2025			200,154			$	51.90										2.64			$	3,414

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, 2025			2,645,379			$	71.84
Granted			551,855				65.86
Vested			(618,865	)			73.59
Forfeited			(164,827	)			91.56
Unvested at July 31, 2025			2,413,542			$	68.68

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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.

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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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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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