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Share-Based Compensation (Tables) | 9 Months Ended
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Jan. 31, 2021
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The following assumptions were used to value the awards:
|  | Three months ended January 31, |  |  | Nine months ended January 31, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Risk-free interest rate |  |  | 0.6 | % |  |  | 1.7 | % |  |  | 0.6 | % |  |  | 1.7 | %
Expected dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
Expected life (in years) |  |  | 5.5 - 5.7 |  |  |  | 5.5 - 5.7 |  |  |  | 5.5 - 5.7 |  |  |  | 5.5 - 5.7 |
Expected volatility |  |  | 136.5 | % |  |  | 127.6% - 128.2 | % |  |  | 136.5 | % |  |  | 127.6% - 128.2 | %
Schedule of Stock Option Activity | A summary of stock options under our stock incentive plans is detailed in the following table.
|  |  |  |  |  |  |  | Weighted |
|  |  |  |  |  |  |  | Average |
|  |  |  |  | Weighted |  |  | Remaining |
|  | Shares |  |  | Average |  |  | Contractual |
|  | Underlying |  |  | Exercise |  |  | Term |
|  | Options |  |  | Price |  |  | (In Years) |
Outstanding as of April 30, 2020 |  |  | 474,128 |  |  | $ | 3.56 |  |  |  | 9.4 |
Granted |  |  | 248,876 |  |  | $ | 2.93 |  |  |  |  |
Exercised |  |  | (175,500 | ) |  | $ | 1.05 |  |  |  |  |
Cancelled/forfeited |  |  | (28,719 | ) |  | $ | 6.29 |  |  |  |  |
Outstanding as of January 31, 2021 |  |  | 518,785 |  |  | $ | 3.96 |  |  |  | 9.2 |
Exercisable as of January 31, 2021 |  |  | 249,577 |  |  | $ | 5.21 |  |  |  | 8.5 |
Schedule of Non-vested Restricted Stock Activity | A summary of non-vested restricted stock under our stock incentive plans is as follows:
|  |  |  |  | Weighted |
|  | Number |  |  | Average Price per |
|  | of Shares |  |  | Share |
Issued and unvested at April 30, 2020 |  |  | 13,513 |  |  | $ | 1.48 |
Granted |  |  | 10,000 |  |  | $ | 2.93 |
Vested |  |  | (13,513 | ) |  | $ | 1.48 |
Cancelled/forfeited |  |  | - |  |  | $ | - |
Issued and unvested at January 31, 2021 |  |  | 10,000 |  |  | $ | 2.93 |
Performance Stock Options [Member] |
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:
|  | Three months ended January 31, |  |  | Nine months ended January 31, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Risk-free interest rate |  |  | 1.2 | % |  |  | 2.3 | % |  |  | 1.2 | % |  |  | 2.3 | %
Expected dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
Expected life (in years) |  |  | 10.0 |  |  |  | 10.0 |  |  |  | 10.0 |  |  |  | 10.0 |
Expected volatility |  |  | 76.0%- 136.5 | % |  |  | 115.0 | % |  |  | 76.0%- 136.5 | % |  |  | 115.0 | %
Schedule of Stock Option Activity | A summary of performance stock options under our stock incentive plans is detailed in the following table.
|  |  |  |  |  |  |  | Weighted |
|  |  |  |  |  |  |  | Average |
|  |  |  |  | Weighted |  |  | Remaining |
|  | Shares |  |  | Average |  |  | Contractual |
|  | Underlying |  |  | Exercise |  |  | Term |
|  | Options |  |  | Price |  |  | (In Years) |
Outstanding as of April 30, 2020 |  |  | 81,347 |  |  | $ | 1.05 |  |  |  | 9.7 |
Granted |  |  | 344,723 |  |  | $ | 2.93 |  |  |  |  |
Exercised |  |  | - |  |  | $ | - |  |  |  |  |
Cancelled/forfeited |  |  | - |  |  | $ | - |  |  |  |  |
Outstanding as of January 31, 2021 |  |  | 426,070 |  |  | $ | 2.57 |  |  |  | 9.8 |
Exercisable as of January 31, 2021 |  |  | 40,681 |  |  | $ | 1.05 |  |  |  | 9.0 |

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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + 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 (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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 http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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