Stockholders' Equity - Schedule of Stock Option Activity (Details)	9 Months Ended
	Jan. 31, 2019 $ / shares shares
Equity [Abstract]
Number of Options Outstanding, Beginning of Period | shares	1,531,458
Number of Options, Granted | shares
Number of Options, Exercised | shares
Number of Options, Forfeited | shares	(75,000)
Number of Options, Cancelled | shares
Number of Options Outstanding, End of Period | shares	1,456,458
Number of Options exercisable at end of period | shares	943,958
Number of Options expected to vest | shares	512,500
Weighted Average Exercise Price Outstanding, Beginning of Period	$ 1.79
Weighted Average Exercise Price, Granted
Weighted Average Exercise Price, Exercised
Weighted Average Exercise Price, Forfeited	1.48
Weighted Average Exercise Price, Cancelled
Weighted Average Exercise Price Outstanding, End of Period	1.80
Weighted Average Exercise Price Options exercisable at end of period	2.28
Weighted Average Exercise Price Options expected to vest	1.47
Weighted Average Exercise Price Weighted average fair value of options granted during the period
Weighted Average Remaining Contractual Life (Years), Beginning of Period	4 years 5 months 5 days
Weighted Average Remaining Contractual Life (Years), Ending of Period	3 years 8 months 2 days