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Fair Value Measurements (Tables) | 12 Months Ended
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Apr. 30, 2021
Fair Value Disclosures [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The Company determined the fair value using the Black-Scholes option pricing model with the following assumptions:
|  | April 30, 2021 |  |  | April 30, 2020 |
Dividend rate |  |  | 0.0 | % |  |  | 0.0 | %
Risk-free rate |  |  | 0.01% - 0.02 | % |  |  | 0.17% - 0.19 | %
Expected life (years) |  |  | 0.2 - 0.6 |  |  |  | 1.2 - 1.6 |
Expected volatility |  |  | 149.8 | % |  |  | 81.8% - 112.7 | %

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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