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Stock-based Compensation and Stockholders' Equity - Summary of Stock-based Compensation by Income Statement Line Item (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 27, 2022 | Feb. 28, 2021 | Feb. 27, 2022 | Feb. 28, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation | $ 622 | $ 797 | $ 1,928 | $ 2,584
Cost of product sales | Continuing operations: |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation | 83 | 141 | 177 | 262
Cost of product sales | Discontinued Operations: |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation | 0 | (34) | 25 | 27
Research and development | Continuing operations: |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation | 51 | 49 | 151 | 175
Selling, general and administrative | Continuing operations: |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation | $ 488 | $ 641 | $ 1,575 | $ 2,120

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