Net Loss Per Common Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares	3 Months Ended		9 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Total	5,719,484	3,683,317	5,719,484	3,683,317
Preferred Stock [Member]
Total	473,684		473,684
Restricted Stock Units [Member]
Total	349,691	524,500	349,691	524,500
Stock Options [Member]
Total	1,000,000	1,456,458	1,000,000	1,456,458
Stock Warrants [Member]
Total	3,896,109	1,702,359	3,896,109	1,702,359