Stockholders' Equity - Schedule of Stock Warrant Activity (Details) - Warrants [Member]	3 Months Ended
	Jul. 31, 2019 $ / shares shares
Number of Warrants Outstanding, Beginning of Period | shares	1,702,359
Number of Warrants, Granted | shares	3,291,250
Number of Warrants, Exercised | shares
Number of Warrants, Forfeited | shares
Number of Warrants, Cancelled | shares
Number of Warrants Outstanding, End of Period | shares	4,993,609
Warrants exercisable at end of period | shares	2,799,859
Weighted Average Exercise Price of Warrants Outstanding, Beginning of Period	$ 3.12
Weighted Average Exercise Price, Granted	1.14
Weighted Average Exercise Price, Exercised
Weighted Average Exercise Price, Forfeited
Weighted Average Exercise Price, Cancelled/Expired
Weighted Average Exercise Price of Warrants Outstanding, End of Period	1.82
Weighted Average Exercise Price, exercisable at end of period	3.96
Weighted average fair value of warrants granted during the period	$ 0.52
Weighted Average Remaining Contractual Life in Years, Beginning of Period	2 years 2 months 30 days
Weighted Average Remaining Contractual Life in Years, Granted	5 years
Weighted Average Remaining Contractual Life in Years, End of Period	3 years 11 months 15 days