STOCK-BASED COMPENSATION (Details 1) - $ / shares	3 Months Ended	9 Months Ended
Feb. 28, 2022	Feb. 28, 2022	Feb. 28, 2021
Stock Option
Expected term (in years)	5 years	6 years	6 years
Volatility	117.00%	77.00%	72.00%
Risk-free interest rates	1.56%	1.03%	0.39%
Weighted-average grant date fair value	$ 9.43	$ 2.56	$ 1.09
Employee Stock Purchase Plan
Weighted-average grant date fair value		$ 9.57	$ 0.44
Maximum \| Employee Stock Purchase Plan
Expected term (in years)		2 years	2 years
Volatility		143.00%	82.00%
Risk-free interest rates		0.27%	0.14%
Minimum \| Employee Stock Purchase Plan
Expected term (in years)		6 months	6 months
Volatility		101.00%	74.00%
Risk-free interest rates		0.05%	0.10%

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809

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