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Stockholders' Equity (Tables)
 9 Months Ended
Jan. 31, 2023
Stockholders' Equity Note [Abstract]  
Schedule of Restricted Stock Unit Activity
A summary of the Company’s RSU activity, granted under the 2012 and 2018 Equity Incentive Plans, during the nine months ended January 31, 2023 is presented below:
Restricted Stock UnitsNumber of SharesWeighted Average Grant Date Fair Value
Unvested balance outstanding, April 30, 2022929,928 $6.12 
Granted15,000 0.35 
Forfeits(185,059)7.65 
Vested(236,813)0.70 
Expired— — 
Unvested balance outstanding, January 31, 2023523,056 $7.87 
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Summary of Warrant Activity A summary of the Company’s warrant activity during the nine months ended January 31, 2023 is presented below:
WarrantsNumber of
Shares		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Term		Aggregate
Intrinsic
Value
Balance Outstanding, April 30, 2022649,174 $4.70 1.96$— 
Granted— $— — — 
Exercised— $— — — 
Surrendered— $— — — 
Expired(224,174)$6.87 — — 
Balance Outstanding, January 31, 2023425,000 $3.56 3.02$— 
Unvested(16,667)
Exercisable, January 31, 2023408,333 $3.42 3.00$— 
Share-based Payment Arrangement, Option, Exercise Price Range
OUTSTANDING WARRANTSEXERCISABLE WARRANTS
Exercise
Price		Weighted
Average
Exercise
Price		Outstanding
Number of
Warrants		Weighted
Average
Exercise
Price		Weighted
Average
Remaining Life
In Years		Exercisable
Number of
Warrants
$1.00 1.00 200,000 $1.00 4.23200,000 
$4.89 $4.89 50,000 $4.89 1.1950,000 
$5.85 $5.85 50,000 $5.85 3.5850,000 
$6.00 $6.00 100,000 $6.00 1.09100,000 
$6.99 $6.99 25,000 $6.99 3.478,333 
 425,000   408,333 
OUTSTANDING OPTIONSEXERCISABLE OPTIONS
Exercise
Price		Weighted
Average
Exercise
Price		Outstanding
Number of
Options		Weighted
Average
Exercise
Price		Weighted
Average
Remaining Life
In Years		Exercisable
Number of
Options
$3.24 to $4.38
$4.00 31,665 $4.00 1.5031,665 
$4.50 to $5.20
$4.97 119,876 $4.97 1.03119,876 
$7.17 to $7.55
$7.45 462,917 $7.45 0.60462,917 
614,458 614,458 
Summary of Stock Option Activity A summary of the Company’s stock option activity for employees and directors during the nine months ended January 31, 2023, is presented below:
OptionsNumber of
Shares		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Term		Aggregate
Intrinsic
Value
Balance Outstanding, April 30, 2022
860,182 $7.03 1.25$— 
Granted— — — — 
Exercised— — — — 
Forfeited(36,634)8.89 — — 
Expired(209,090)7.42 — — 
Balance Outstanding, January 31, 2023
614,458 $6.79 0.73$— 
Exercisable, January 31, 2023
614,458 $6.79 0.73$— 
Schedule of Share-Based Compensation
A summary of the Company’s stock-based compensation expense, which is included in "general and administrative" expense in the consolidated statement of operations is presented below:


Three Months Ended January 31,Nine Months Ended January 31,
2023202220232022
RSUs$394,510 $397,241 $893,769 $1,532,147 
Restricted Stock— 286,231 — 307,283 
Stock options— 17,225 5,407 126,137 
Total stock-based compensation expense$394,510 $700,697 $899,176 $1,965,567