INCOME TAXES (Details 2)	12 Months Ended
May 31, 2023	May 31, 2022	May 31, 2021
INCOME TAXES
U.S. federal statutory tax rate	21.00%	21.00%	21.00%
State taxes, net of federal tax effect	0.00%	0.10%	0.60%
Foreign rate differential	0.70%	0.30%	9.80%
Stock-based compensation	(9.10%)	(11.00%)	(4.70%)
Research and development credit	(2.30%)	(1.30%)	4.00%
Change in valuation allowance	(9.30%)	(4.70%)	(32.10%)
Controlled Foreign Corporation Liquidation	0.00%	0.00%	9.80%
PPP Loan	0.00%	(3.70%)	0.00%
Other	(0.60%)	0.40%	(0.40%)
Effective tax rate	0.40%	1.10%	8.00%

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to disposition of a business not qualifying as a discontinued operation.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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