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Common Stock, Preferred Stock and Warrants (Tables)
6 Months Ended
Oct. 31, 2020
Stockholders' Equity Note [Abstract]  
Assumptions used to estimate fair value of warrants
   October 31, 2020
Expected volatility   89-95%
Expected dividends   0%
Expected term   4.92-5 Years 
Risk-free interest rate   0.27-0.29%
Changes in warrants outstanding issued to non-employees of the Company
  

 

Number of Warrants

 

 

 

Weighted Average Exercise Price

 

 

 

Weighted Average Grant Date Fair Value

 

 

 

Expiration Date (yrs)

 

 

 

Value if Exercised

 

Balance as of April 30, 2020    —      —      —      —     $—   
Granted    399,998    1.50    0.67    5.00    599,997 
Exercised    —      —      —      —      —   
Cancelled/Expired    —      —      —      —      —   
Outstanding as of October 31, 2020    399,998   $1.50   $0.67    4.92   $599,997