Stockholders' Equity - Schedule of Stock Warrant Activity (Details) - Warrants [Member]	9 Months Ended
	Jan. 31, 2019 $ / shares shares
Number of Warrants Outstanding, Beginning of Period | shares	1,702,359
Number of Warrants, Granted | shares
Number of Warrants, Exercised | shares
Number of Warrants, Forfeited | shares
Number of Warrants, Cancelled | shares
Number of Warrants Outstanding, End of Period | shares	1,702,359
Warrants exercisable at end of period | shares	1,702,359
Weighted Average Exercise Price of Warrants Outstanding, Beginning of Period	$ 3.12
Weighted Average Exercise Price, Granted
Weighted Average Exercise Price, Exercised
Weighted Average Exercise Price, Forfeited
Weighted Average Exercise Price, Cancelled
Weighted Average Exercise Price of Warrants Outstanding, End of Period	3.12
Weighted Average Exercise Price, exercisable at end of period	3.12
Weighted average fair value of warrants granted during the period
Weighted Average Remaining Contractual Life in Years, Beginning of Period	3 years 2 months 30 days
Weighted Average Remaining Contractual Life in Years, End of Period	2 years 5 months 27 days