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Stock-based Compensation (Tables) | 3 Months Ended
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Jul. 31, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
Summary of Stock Option Using the Black-Scholes Option-Pricing Model on Grant Date | During the three months ended July 31, 2024, management estimated the fair value of the awards utilizing the Black-Scholes Option Pricing model with the following weighted-average assumptions:
Risk free interest rate |  |  | 4.35 | %
Volatility |  |  | 103.9 | %
Weighted average expected term (in years) |  |  | 5.0 |
Service-based Stock Option |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
Summary of Stock Option Activity | The following is a summary of service-based stock option activity during the three months ended July 31, 2024:
|  | Number of Options Outstanding |  |  | Weighted Average Exercise Price |  |  | Average Remaining Contractual Life (in years) |
Outstanding - April 30, 2024 |  |  | 18,659 |  |  | $ | 121.00 |  |  |  | 8.9 |
Granted |  |  | 1,500 |  |  |  | 5.15 |  |  |  | 9.8 |
Outstanding - July 31, 2024 |  |  | 20,159 |  |  | $ | 121.00 |  |  |  | 8.7 |
Non-vested at July 31, 2024 |  |  | 12,929 |  |  | $ | 42.00 |  |  |  | 9.3 |
Vested at July 31, 2024 |  |  | 7,230 |  |  | $ | 264.00 |  |  |  | 7.7 |
Performance-based Stock Option |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
Summary of Stock Option Activity | The following is a summary of performance-based stock option activity during the three months ended July 31, 2024:
|  | Number of Options Outstanding |  |  | Weighted Average Exercise Price |  |  | Average Remaining Contractual Life (in years) |
Outstanding - April 30, 2024 |  |  | 5,456 |  |  | $ | 502.00 |  |  |  | 5.9 |
Granted |  |  | — |  |  |  | — |  |  |  | — |
Outstanding - July 31, 2024 |  |  | 5,456 |  |  | $ | 502.00 |  |  |  | 5.7 |
Non-vested at July 31, 2024 |  |  | 3,565 |  |  | $ | 626.00 |  |  |  | 5.4 |
Vested at July 31, 2024 |  |  | 1,891 |  |  | $ | 268.00 |  |  |  | 6.0 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + 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 -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Line items represent financial concepts included in a table. 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