Income Taxes - Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
May 31, 2023	May 31, 2022	May 31, 2021
Reasons for consolidated income tax provision
Income tax benefit at federal statutory tax rate of 21.0%, 21.0% and 21.0%, respectively	$ (11,432)	$ (6,289)	$ (7,571)
State income taxes, net of Federal tax benefit	(353)	(536)	(462)
Impact of Non-U.S. operations	14	199	(293)
Research and development tax credit	(991)	395	(1,303)
Meals and entertainment	258	179	116
Goodwill impairment	3,055	0	0
Non-deductible executive compensation	366	686	107
Change in valuation allowance	5,556	3,168	3,921
Stock based compensation	505	(1,616)	526
Other	1,027	412	455
Income tax benefit	$ (1,995)	$ (3,402)	$ (4,504)

Effective Income Tax Rate Reconciliation, Nondeductible Expense, Executive Compensation, Amount

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The portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to the impact of non US operations.

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Income Tax Reconciliation, Effect of Elimination of ASC 718 APIC Pool

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

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Amount 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 increase (decrease) in the valuation allowance for deferred tax assets.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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