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STOCKBASED COMPENSATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2023 | Feb. 28, 2022 | Feb. 28, 2023 | Feb. 28, 2022
Total stock-based compensation | $ 592 | $ 880 | $ 2,095 | $ 2,186
Cost of Sales |  |  |  |
Total stock-based compensation | 75 | 90 | 252 | 248
Selling, General and Administrative |  |  |  |
Total stock-based compensation | 359 | 487 | 1,330 | 1,259
Research and Development |  |  |  |
Total stock-based compensation | $ 158 | $ 303 | $ 513 | $ 679

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