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Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Summary of Warrant Activity (Details)

v3.23.1
Stockholders' Equity - Summary of Warrant Activity (Details) - Warrant - USD ($)
 9 Months Ended 12 Months Ended
Jan. 31, 2023
Apr. 30, 2022
Number of Shares Ìý Ìý
Balance Outstanding at beginning of period (in shares) 649,174 Ìý
Expired (in shares) (224,174) Ìý
Balance Outstanding at end of period (in shares) 425,000 649,174
Unvested (in shares) (16,667) Ìý
Number of Shares, Exercisable (in shares) 408,333 Ìý
Weighted Average Exercise Price Ìý Ìý
Balance Outstanding at beginning of period (in dollars per share) $ 4.70 Ìý
Expired (in dollars per share) 6.87 Ìý
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 Ìý
Weighted Average Remaining Contractual Term Ìý Ìý
Weighted Average Remaining Contractual Term, Outstanding 3 years 7 days 1 year 11 months 15 days
Weighted Average Remaining Contractual Term, Exercisable 3 years Ìý
Aggregate Intrinsic Value Ìý Ìý
Average Intrinsic Value, Outstanding $ 0 $ 0
Aggregate Intrinsic Value, Exercisable $ 0 Ìý