Stock-based Compensation (Tables)

9 Months Ended

Oct. 31, 2024

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 October 31,				Nine Months Ended October 31,
	2024		2023		2024		2023
	(in thousands)
Stock-based compensation:
Cost of revenue	$	899	$	868	$	2,339	$	2,694
Research and development		18,637		17,898		54,653		54,809
Selling, general and administrative		7,311		8,643		23,503		25,293
Total stock-based compensation	$	26,847	$	27,409	$	80,495	$	82,796

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 October 31,						Nine Months Ended October 31,
	2024			2023			2024			2023
Employee stock purchase plan awards:
Volatility		56	%		54	%		47	%		56	%
Risk-free interest rate		4.55	%		5.49	%		4.97	%		5.11	%
Expected term (years)	0.5			0.5			0.5			0.5
Dividend yield		0	%		0	%		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, 2024		373,318		$	46.39
Exercised		(105,890	)		37.59		$	1,705
Forfeited		(63	)		111.50
Expired		(1,425	)		50.93
Outstanding at October 31, 2024		265,940			49.86					3.64	$	2,883
Exercisable at October 31, 2024		246,289		$	51.26					3.45	$	2,377

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, 2024		2,432,640		$	82.54
Granted		1,431,816			62.12
Vested		(851,932	)		75.81
Forfeited		(151,000	)		118.07
Unvested at October 31, 2024		2,861,524		$	72.45