Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Summary of Warrant Activity (Details)

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Stockholders' Equity - Summary of Warrant Activity (Details) - Warrant - USD ($)
 9 Months Ended 12 Months Ended
Jan. 31, 2023
Apr. 30, 2022
Number of Shares    
Balance Outstanding at beginning of period (in shares) 649,174  
Expired (in shares) (224,174)  
Balance Outstanding at end of period (in shares) 425,000 649,174
Unvested (in shares) (16,667)  
Number of Shares, Exercisable (in shares) 408,333  
Weighted Average Exercise Price    
Balance Outstanding at beginning of period (in dollars per share) $ 4.70  
Expired (in dollars per share) 6.87  
Balance Outstanding at end of period (in dollars per share) 3.56 $ 4.70
Exercisable, Weighted Average Exercise Price (in dollars per share) $ 3.42  
Weighted Average Remaining Contractual Term    
Weighted Average Remaining Contractual Term, Outstanding 3 years 7 days 1 year 11 months 15 days
Weighted Average Remaining Contractual Term, Exercisable 3 years  
Aggregate Intrinsic Value    
Average Intrinsic Value, Outstanding $ 0 $ 0
Aggregate Intrinsic Value, Exercisable $ 0