Stockholders' Equity (Tables)

12 Months Ended

May 31, 2024

Equity [Abstract]

Schedule of Stock Option Activity

The following table summarizes information about stock option activity for the fiscal year ended May 31, 2024:

	Shares	Weighted average exercise price		Weighted average remaining contractual life	Aggregate intrinsic value (in thousands)
Outstanding at beginning of year - June 1, 2023	2,206,549	$	17.90
Granted	455,527	$	8.92
Exercised	—	$	—
Forfeited	(198,975)	$	17.16
Expired	(300,118)	$	16.33
Outstanding at end of year - May 31, 2024	2,162,983	$	16.29	6.52	$	—
Options exercisable at year-end	1,317,662	$	17.44	5.44	$	—
Options expected to vest in future periods	845,321	$	14.51	8.20	$	—

Summary of Stock Unit Activity

The following table summarizes information about restricted stock unit activity for the year ended May 31, 2024:

	Restricted Stock Units	Weighted Average Grant-Date Fair Value
Non-vested at beginning of year, June 1, 2023	736,020	$	18.99
Granted	912,200	$	8.74
Vested	(485,056)	$	8.63
Canceled	(82,266)	$	12.77
Non-vested at end of year, May 31, 2024	1,080,898	$	12.44

 The following table summarizes information about performance unit award activity for the year ended May 31, 2024:

	Performance Unit Awards	Weighted Average Grant-Date Fair Value
Non-vested at beginning of year, June 1, 2023	548,530	$	19.23
Granted	487,856	$	8.92
Vested	(148,621)	$	8.92
Canceled	(145,057)	$	12.12
Non-vested at end of year, May 31, 2024	742,708	$	16.13

Schedule of Break Out of Stock-based Compensation

The following tables represents the break out of stock-based compensation included in the Company's Consolidated Statement of Operations:

	Year ended May 31,
(in thousands)	2024		2023		2022
Cost of sales	$	288	$	793	$	827
Research and development	1,400		1,459		1,298
Sales and marketing	3,243		2,922		2,568
General and administrative	5,595		5,984		5,999
Acquisition, restructuring and other items, net	3		—		—
	$	10,529	$	11,158	$	10,692