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Warrants (Tables)
12 Months Ended
Apr. 30, 2021
Stockholders' Equity Note [Abstract]  
Assumptions used to estimate fair value of warrants
    April 30, 2021
Expected volatility     86-89 %
Expected dividends     0 %
Expected term     4.42-5 Years  
Risk-free interest rate     0.29-0.61 %
Changes in warrants outstanding issued to non-employees of the Company
  

 

Number of Shares 

 

 

Weighted-average Exercise Price per Share

 

 

Weighted-average Remaining Contractual Term

(in years) 

 

 

Aggregate Intrinsic Value 

 Balance as of April 30, 2020—     $         $   
 Granted    1,074,998    1.50         
 Exercised    (201,666)   1.50        
 Outstanding as of April 30, 2021873,332   $1.50    4.62   $2,218,263