STOCK-BASED COMPENSATION (Details 1) - USD ($)	3 Months Ended	6 Months Ended
Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2021	Nov. 30, 2020
Employee Stock Purchase Plan
Weighted-average grant date fair value	$ 9.57	$ 0.42	$ 9.57	$ 0.42
Expected dividend	$ 0	$ 0	$ 0.00	$ 0.00
Estimated forfeiture rate	0.00%	0.00%	0.00%	0.00%
Employee Stock Purchase Plan \| Maximum
Expected term (in years)	2 years	2 years	2 years	2 years
Volatility	143.00%	82.00%	1.43%	0.82%
Risk-free interest rates	0.27%	0.14%	0.27%	0.14%
Employee Stock Purchase Plan \| Minimum
Expected term (in years)	5 months 30 days	5 months 30 days	6 months	6 months
Volatility	101.00%	74.00%	1.01%	0.74%
Risk-free interest rates	0.05%	0.10%	0.05%	0.10%
Stock Option [Member]
Expected term (in years)	6 years	6 years	6 years	6 years
Volatility	0.85%	0.73%	0.76%	0.72%
Risk-free interest rates	1.32%	0.43%	1.02%	0.39%
Weighted-average grant date fair value	$ 14.16	$ 0.91	$ 2.50	$ 1.09

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- Definition

The estimated amount of dividends to be paid to holders of the underlying shares (expected dividends) over the option's term. Dividends are taken into account because payment of dividends to shareholders reduces the fair value of the underlying shares, and option holders generally do not receive dividends.

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- Definition

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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
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-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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