Schedule of Significant Components of Deferred Tax Assets (Details) - USD ($) |
Jul. 31, 2022 |
Jul. 31, 2021 |
|---|---|---|
| Income Tax Disclosure [Abstract] | ||
| Net operating loss carryforwards | $ 63,759,000 | $ 56,369,000 |
| Credits | 7,082,000 | 5,566,000 |
| Start-up costs | 14,000 | 17,000 |
| Accumulated depreciation | 68,000 | 74,000 |
| Option and stock awards | 1,148,000 | 1,179,000 |
| Other | 162,000 | 180,000 |
| Net deferred tax assets | 72,233,000 | 63,385,000 |
| Valuation allowance for deferred tax assets | (72,233,000) | (63,385,000) |
| Net deferred taxes |
| X | ||||||||||
- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to accumulated depreciation. No definition available.
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| X | ||||||||||
- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to options and stock awards. No definition available.
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| X | ||||||||||
- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to start up costs. No definition available.
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as other. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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