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Share-Based Compensation Plans (Tables) | 12 Months Ended
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Apr. 30, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
Schedule of Stock Option Valuation Assumptions | Schedule of Stock Option Valuation Assumptions
|  | Twelve months ended April 30, |
|  | 2022 |  |  | 2021 |
Risk-free interest rate |  |  | 1.5 | % |  |  | 0.6 | %
Expected dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
Expected life (in years) |  |  | 5.5 |  |  |  | 5.5 - 5.8 |
Expected volatility |  |  | 121.9 | % |  |  | 136.5 | %
Schedule of Stock Option Activity | Schedule of Stock Option Activity
|  | Shares Underlying Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (In Years) |
Outstanding as of April 30, 2021 |  |  | 516,827 |  |  | $ | 3.89 |  |  |  | 9.0 |
Granted |  |  | 793,850 |  |  | $ | 1.43 |  |  |  |  |
Exercised |  |  | (45,332 | ) |  | $ | 1.05 |  |  |  |  |
Cancelled/forfeited |  |  | (153,183 | ) |  | $ | 2.86 |  |  |  |  |
Expired |  |  | (1,806 | ) |  | $ | 32.62 |  |  |  |  |
Outstanding as of April 30, 2022 |  |  | 1,110,356 |  |  | $ | 2.34 |  |  |  | 9.2 |
Exercisable as of April 30, 2022 |  |  | 297,504 |  |  | $ | 4.65 |  |  |  | 7.8 |
Schedule of Non-vested Restricted Stock Activity | A summary of unvested restricted stock under our stock incentive plans is as follows: Schedule of Non-vested Restricted Stock Activity
|  | Number of Shares |  |  | Weighted Average Price per Share |
Issued and unvested at April 30, 2021 |  |  | 10,000 |  |  | $ | 2.93 |
Granted |  |  | 827,764 |  |  | $ | 1.41 |
Vested |  |  | (10,000 | ) |  | $ | 2.93 |
Cancelled/forfeited |  |  | — |  |  | $ | — |
Issued and unvested at April 30, 2022 |  |  | 827,764 |  |  | $ | 1.41 |
Performance Stock Options [Member] |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
Schedule of Stock Option Activity | A summary of performance stock options under our stock incentive plans is detailed in the following table. Schedule of Stock Option Activity
|  | Shares Underlying Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (In Years) |
Outstanding as of April 30, 2021 |  |  | 424,790 |  |  | $ | 2.57 |  |  |  | 9.5 |
Granted |  |  | 66,667 |  |  | $ | 0.62 |  |  |  |  |
Exercised |  |  | (40,668 | ) |  | $ | 1 |  |  |  |  |
Cancelled/forfeited |  |  | (240,667 | ) |  | $ | 2.61 |  |  |  |  |
Outstanding as of April 30, 2022 |  |  | 210,122 |  |  | $ | 2.20 |  |  |  | 8.8 |
Exercisable as of April 30, 2022 |  |  | — |  |  | $ | — |  |  |  |  |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The Company determined these awards contain a market-based condition and estimated the fair value using the Monte Carlo simulation model with the following assumptions: Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
|  | Twelve months ended April 30, |
|  | 2022 |  |  | 2021 |
Risk-free interest rate |  |  | N/A |  |  |  | 1.2 | %
Expected dividend yield |  |  | N/A |  |  |  | 0.0% |
Expected life (in years) |  |  | N/A |  |  |  | 10.0 |
Expected volatility |  |  | N/A |  |  |  | 76.0%- 136.5 | %

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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