INCOME TAXES (Details 2)	12 Months Ended
May 31, 2022	May 31, 2021	May 31, 2020
INCOME TAXES (Details 2)
U.S. federal statutory tax rate	21.00%	21.00%	21.00%
State taxes, net of federal tax effect	0.10%	0.60%	1.40%
Foreign rate differential	0.30%	9.80%	(21.50%)
Stock-based compensation	(11.00%)	(4.70%)	(4.00%)
Research and development credit	(1.30%)	4.00%
Change in valuation allowance	(4.70%)	(32.10%)	4.30%
Controlled Foreign Corporation Liquidation		9.80%
PPP Loan	(3.70%)
Other	0.40%	(0.40%)	(2.50%)
Effective tax rate	1.10%	8.00%	(1.30%)

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-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
-Publisher FASB
-Name Accounting Standards Codification
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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.

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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 statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for share-based payment arrangement.

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