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STOCK-BASED COMPENSATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2022 | Feb. 28, 2021 | Feb. 28, 2022 | Feb. 28, 2021
Total stock-based compensation | $ 880 | $ 271 | $ 2,186 | $ 798
Cost of Sales |  |  |  |
Total stock-based compensation | 90 | 14 | 248 | 45
Selling, General and Administrative |  |  |  |
Total stock-based compensation | 487 | 194 | 1,259 | 593
Research and Development |  |  |  |
Total stock-based compensation | $ 303 | $ 63 | $ 679 | $ 160

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