Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jan. 31, 2019	Apr. 30, 2018
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	50,000,000	50,000,000
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	19,125,263	17,590,574
Common stock, shares outstanding	18,600,763	17,590,574
Convertible Series C Preferred Stock [Member]
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	45,002	45,002
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Convertible Series E Preferred Stock [Member]
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	2,500	2,500
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0