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Warrants - Schedule of Fair Value Assumptions Used (Details)	Apr. 30, 2020	Apr. 30, 2019
Dividend Rate [Member]
Fair value measurement input, percentage	0.0	0.0
Risk Free Interest Rate [Member] | Minimum [Member]
Fair value measurement input, percentage	0.17	2.2
Risk Free Interest Rate [Member] | Maximum [Member]
Fair value measurement input, percentage	0.19	2.3
Expected Life (Years) [Member] | Minimum [Member]
Fair value measurement expected life	1 year 2 months 12 days	2 years 2 months 12 days
Expected Life (Years) [Member] | Maximum [Member]
Fair value measurement expected life	1 year 7 months 6 days	2 years 7 months 6 days
Expected Volatility [Member] | Minimum [Member]
Fair value measurement input, percentage	81.8	110.0
Expected Volatility [Member] | Maximum [Member]
Fair value measurement input, percentage	112.7	153.4

X

- Definition

Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur.

+ 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

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X

- Definition

Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-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

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