Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Schedule of Weighted-average Black-Scholes Assumptions (Details)

v3.19.2
Stockholders' Equity - Schedule of Weighted-average Black-Scholes Assumptions (Details)
12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Risk free interest rate 0.00%  
Dividend yield 0.00% 0.00%
Expected volatility 0.00%  
Contractual term 0 years  
Forfeiture rate 0.00% 0.00%
Risk free interest rate, minimum   2.26%
Risk free interest rate, maximum   2.81%
Expected volatility, minimum   93.47%
Expected volatility, maximum   100.00%
Minimum [Member]    
Contractual term   4 years 7 months 24 days
Maximum [Member]    
Contractual term   5 years