Net Loss Per Common Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares	6 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Total	7,161,251	3,683,817
Preferred Stock [Member]
Total	473,684
Restricted Stock Units [Member]
Total	325,000	500,000
Stock Options [Member]
Total	1,368,958	1,481,458
Stock Warrants [Member]
Total	4,993,609	1,702,359