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Stock-based Compensation and Stockholders' Equity
 3 Months Ended
Aug. 27, 2023
Share-Based Payment Arrangement [Abstract]  
Stock-based Compensation and Stockholders' Equity Stock-based Compensation and Stockholders’ Equity
Stock-Based Compensation Activity
A summary of the activity under the Company’s stock option plans as of August 27, 2023 and changes during the fiscal year then ended is presented below:
 Options OutstandingWeighted-Average Exercise Price Per ShareTotal Intrinsic Value of Options Exercised
(in thousands)		Weighted-Average Remaining Contractual Term in YearsAggregate Intrinsic Value
Options outstanding at May 28, 20232,374,325 $10.88 
Granted
2,100 $10.48 
Exercised
(95,800)$9.38 $115 
Expired
(119,850)$11.79 
Options outstanding at August 27, 2023
2,160,775 $10.89 4.16$— 
Options exercisable at August 27, 2023
1,506,237 $10.96 3.49$— 

A summary of the Company’s restricted stock unit (“RSU”) award activity as of August 27, 2023 and changes during the fiscal year then ended is presented below:
 Restricted Stock Units OutstandingWeighted-Average Grant Date Fair Value Per Share
Restricted stock units outstanding at May 28, 2023336,791 $9.70 
Granted1,057,656 $8.25 
Vested(56,844)$9.50 
Restricted stock units outstanding at August 27, 20231,337,603 $8.56 

Stock-Based Compensation Expense

The following table summarizes stock-based compensation by income statement line item:
Three Months Ended
(In thousands)August 27, 2023August 28, 2022
Continuing operations:
Cost of goods sold
$184 $101 
Research and development43 90 
Selling, general and administrative1,306 594 
Total stock-based compensation$1,533 $785 

As of August 27, 2023, there was $11.4 million of total unrecognized compensation expense related to unvested equity compensation awards granted under the Lifecore incentive stock plans. Total expense is expected to be recognized over the weighted-average period of 1.59 years for stock options and 2.25 years for RSUs.