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Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Apr. 30, 2022
Apr. 30, 2021
Income Tax Disclosure [Abstract]    
Federal net operating loss carryforwards $ 40,338 $ 36,340
Foreign net operating loss carryforwards 2,061 4,064
State operating loss carryforwards 968 581
Federal and New Jersey research and development tax credits 4,167 3,303
Stock compensation 429 346
Accrued expenses 79 158
Other (445) 545
Net deferred tax assets before valuation allowance 47,597 45,337
Valuation allowance (47,597) (45,091)
Deferred tax assets 246
Other liability 203 246
Net deferred tax assets (liabilities) $ (203)