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Stock-based Compensation and Stockholders' Equity (Tables)
 9 Months Ended
Feb. 25, 2024
Share-Based Payment Arrangement [Abstract]  
Share-Based Payment Arrangement, Activity
A summary of the activity under the Company’s stock option plans as of February 25, 2024 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 Years)Aggregate Intrinsic Value
Options outstanding at May 28, 20232,374,325 $10.88 
Options granted6,300 $7.51 
Options exercised(95,800)$9.38 $115 
Options expired(119,850)$11.79 
Options outstanding at February 25, 20242,164,975 $10.88 1.21$— 
Options exercisable at February 25, 20241,712,287 $10.95 1.90$— 
A summary of the Company’s restricted stock unit (“RSU”) award activity as of February 25, 2024 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 
Granted1,058,556 $8.25 
Vested(155,942)$8.03 
Restricted stock units outstanding at February 25, 20241,239,405 $8.67 
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
The following table summarizes stock-based compensation by income statement line item:
Three Months EndedNine Months Ended
(In thousands)February 25, 2024February 26, 2023February 25, 2024February 26, 2023
Continuing operations:
Cost of product sales$187 $109 549 $307 
Research and development42 31 126 173 
Selling, general and administrative1,265 763 3,928 2,316 
Total stock-based compensation$1,494 $903 $4,603 $2,796