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Share-Based Compensation Plans (Tables)

12 Months Ended

Apr. 30, 2022

Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]

Schedule of Stock Option Valuation Assumptions

Schedule of Stock Option Valuation Assumptions 

		Twelve months ended April 30,
		2022				2021
Risk-free interest rate			1.5	%			0.6	%
Expected dividend yield			0.0	%			0.0	%
Expected life (in years)			5.5				5.5 - 5.8
Expected volatility			121.9	%			136.5	%

Schedule of Stock Option Activity

Schedule of Stock Option Activity 

		Shares Underlying Options				Weighted Average Exercise Price				Weighted Average Remaining Contractual Term (In Years)
Outstanding as of April 30, 2021			516,827			$	3.89				9.0
Granted			793,850			$	1.43
Exercised			(45,332	)		$	1.05
Cancelled/forfeited			(153,183	)		$	2.86
Expired			(1,806	)		$	32.62
Outstanding as of April 30, 2022			1,110,356			$	2.34				9.2
Exercisable as of April 30, 2022			297,504			$	4.65				7.8

Schedule of Non-vested Restricted Stock Activity

A summary of unvested restricted stock under our stock incentive plans is as follows:

Schedule of Non-vested Restricted Stock Activity 

		Number of Shares				Weighted Average Price per Share
Issued and unvested at April 30, 2021			10,000			$	2.93
Granted			827,764			$	1.41
Vested			(10,000	)		$	2.93
Cancelled/forfeited			—			$	—
Issued and unvested at April 30, 2022			827,764			$	1.41

Performance Stock Options [Member]

Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]

Schedule of Stock Option Activity

A summary of performance stock options under our stock incentive plans is detailed in the following table.

Schedule of Stock Option Activity 

		Shares Underlying Options				Weighted Average Exercise Price				Weighted Average Remaining Contractual Term (In Years)
Outstanding as of April 30, 2021			424,790			$	2.57				9.5
Granted			66,667			$	0.62
Exercised			(40,668	)		$	1
Cancelled/forfeited			(240,667	)		$	2.61
Outstanding as of April 30, 2022			210,122			$	2.20				8.8
Exercisable as of April 30, 2022			—			$	—

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The Company determined these awards contain a market-based condition and estimated the fair value using the Monte Carlo simulation model with the following assumptions:

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions 

		Twelve months ended April 30,
		2022				2021
Risk-free interest rate			N/A				1.2	%
Expected dividend yield			N/A				0.0%
Expected life (in years)			N/A				10.0
Expected volatility			N/A				76.0%- 136.5	%

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