STOCK-BASED COMPENSATION

6 Months Ended

Nov. 30, 2023

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION

10. STOCK-BASED COMPENSATION

Stock-based compensation expense consists of expenses for stock options, restricted stock units (“RSUs”), performance RSUs (“PRSUs”), restricted shares, performance restricted shares and employee stock purchase plan (“ESPP”), purchase rights. Stock-based compensation expense for stock options and ESPP purchase rights is measured at each grant date, based on the fair value of the award using the Black-Scholes option valuation model, and is recognized as expense over the employee’s requisite service period. This model was developed for use in estimating the value of publicly traded options that have no vesting restrictions and are fully transferable. The Company’s employee stock options have characteristics significantly different from those of publicly traded options. For RSUs, PRSUs, restricted shares and performance restricted shares, stock-based compensation expense is based on the fair value of the Company’s common stock at the grant date and is recognized as expense over the employee’s requisite service period. All of the Company’s stock-based compensation is accounted for as equity instruments. See Note 13 in the Company’s Annual Report on Form 10-K for fiscal 2023 filed on August 28, 2023 for further information regarding the 2016 Equity Incentive Plan and the ESPP. On October 23, 2023, the shareholders of the Company approved the 2023 Equity Incentive Plan and on October 27, 2023, the Company filed the Form S-8 to issue awards during this quarter onwards from a pool of 1,500,000 shares. Full value awards, which are equity awards other than options, stock appreciation rights or other awards that are based solely on an increase in value of the shares following the grant date, when granted or forfeited will be counted as the same number of common stock shares added or deducted to the remaining available shares for issuance under the 2023 Equity Incentive Plan. 

The following table summarizes the stock-based compensation expense for the three and six months ended November 30, 2023 and 2022:

	Three Months Ended November 30,				Six Months Ended November 30,
(In thousands)	2023		2022		2023		2022
Cost of sales	$	101	$	85	$	164	$	177
Research and development		139		201		292		355
Selling, general and administrative		398		507		704		971
	$	638	$	793	$	1,160	$	1,503

There was $170,000 and $120,000 in stock-based compensation expense capitalized as part of inventory as of November 30, 2023 and as of May 31, 2023, respectively.

The Company’s nonvested RSU, PRSU and restricted shares activities during the three and six months ended November 30, 2023, were as follows:

				Weighted
				Average Grant
				Date Fair
	Shares			Value
	(in thousands)			Per Share
Unvested, May 31, 2023		345		$	6.40
Granted		-
Vested		(77	)		7.16
Forfeited		(52	)		5.79
Unvested, August 31, 2023		216		$	6.27
Granted		203			31.51
Vested		(28	)		8.02
Forfeited		(1	)		29.79
Unvested, November 30, 2023		390		$	19.28

Under the ESPP, the Company issued 24,000 and 109,000 shares, respectively, during the six months ended November 30, 2023 and 2022. As of November 30, 2023 and 2022, there were 373,000 and 499,000 ESPP shares available for issuance, respectively.