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Stock-based compensation (Tables) | 12 Months Ended
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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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