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Summary of Significant Accounting Policies - Summary of Warrants Granted Valuation using Black-Scholes Pricing Method (Details) - Warrant [Member] - Valuation Technique, Option Pricing Model [Member] | 12 Months Ended
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Apr. 30, 2020
Measurement Input, Expected Dividend Rate [Member] |
Measurement input, rate | 0
Minimum [Member] | Measurement Input Expected Term [Member] |
Measurement input, term | 2 years
Minimum [Member] | Measurement Input, Price Volatility [Member] |
Measurement input, rate | 1.214
Minimum [Member] | Measurement Input, Risk Free Interest Rate [Member] |
Measurement input, rate | 0.0036
Maximum [Member] | Measurement Input Expected Term [Member] |
Measurement input, term | 5 years
Maximum [Member] | Measurement Input, Price Volatility [Member] |
Measurement input, rate | 1.442
Maximum [Member] | Measurement Input, Risk Free Interest Rate [Member] |
Measurement input, rate | 0.0243

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- Definition Value of input used to measure alternative investment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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