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Stock-based compensation (Tables)

12 Months Ended

May 25, 2025

Share-Based Payment Arrangement [Abstract]

Schedule of Stock Option Weighted Average Assumptions

The following table presents information about the fair value of stock-based awards:

			Stock options												PSUs
			Year ended												Year ended
			May 25, 2025						May 26, 2024						May 25, 2025						May 26, 2024
Weighted-average grant date fair value per share			$	4.32					$	3.91					3.85						4.66
Weighted-average assumptions used to determine grant-date fair value:
Expected life			4.4 years						4.4 years						5.0 years						5.0 years
Risk-free interest rate			4.0		%				4.3		%				3.7		%				4.4		%
Volatility			84		%				58		%				82		%				78		%
Dividend yield			—		%				—		%				—		%				—		%

Schedule of Other Information about Stock-Based Awards

The following table presents other information about stock-based awards:

			Year ended
			May 25, 2025						May 26, 2024
Weighted average grant-date fair value of RSUs awarded per share			$	5.50					$	7.48
Intrinsic value of stock options exercised			—						115
Fair value of RSUs vested per share			7.93						7.74
Fair value of PSUs vested per share			4.24						—
Tax benefit of options exercised			—						35

Summary of Stock Option Activity

The following table presents information about stock option balances and activity:

			Shares						Weighted-average exercise price per share						Weighted-average remaining contractual term						Aggregate intrinsic value
Outstanding at May 26, 2024			2,112,591						$	10.88
Granted			755,775						6.64
Forfeited			(155,189)						7.49
Expired			(1,452,878)						11.04
Outstanding at May 25, 2025			1,260,299						8.57						4.5 years						$	225,294
Exercisable at May 25, 2025			599,970						10.57						2.3 years						1,361

Summary of Stock-based Compensation Activity

The following table presents information about recent RSU and PSU activity:

			RSUs												PSUs
			Shares						Weighted-average grant date fair value per share						Shares						Weighted-average grant date fair value per share
Outstanding at May 26, 2024			1,622,004						$	7.83					1,500,000						$	4.66
Granted			1,038,287						5.50						1,120,000						3.85
Vested			(756,547)						7.93						(75,000)						4.24
Forfeited			(384,457)						7.67						—						—
Outstanding at May 25, 2025			1,519,287						6.23						2,545,000						4.32

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

The following table summarizes stock-based compensation by income statement line item:

			Year ended
			May 25, 2025						May 26, 2024
Cost of product sales			$	856					$	582
Research and development expense			(122)						168
Selling, general and administrative expense			9,424						5,451
Stock-based compensation expense			$	10,158					$	6,201

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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