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Stock-based Payments (Tables)

12 Months Ended

Apr. 30, 2021

Share-based Payment Arrangement [Abstract]

Schedule of Employee Service Stock-based Compensation, Allocation of Recognized Period Costs

Stock-based compensation costs were recorded as follows (in thousands):

			Year Ended April 30,
			2021						2020
General and administrative			$	292					$	328
Sales and marketing			199						237
Research and development			23						13
TOS cost of sales			84						21
POS cost of sales			—						1
Total stock-based compensation expense			$	598					$	600

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

Black-Scholes assumptions used to calculate the fair value of options granted during the years ended April 30, 2021 and 2020 were as follows:

			Year Ended April 30,
			2021						2020
Expected term in years			3-6						3 - 6
Risk-free interest rates			0.1% - 0.5%						1.3% - 1.8%
Volatility			70% - 75%						69% - 71%
Dividend yield			—%						—%

Schedule of Stock-based Compensation, Stock Options, Activity

The Company’s stock options activity and related information as of and for the years ended April 30, 2021 and 2020 is as follows: 

			Non- Employees						Directors and Employees						Total						Weighted Average Exercise Price						Weighted Average Remaining Contractual Life (Years)						Aggregate Intrinsic Value
Outstanding, May 1, 2020			43,332						2,228,326						2,271,658						$	3.23					5.0						$	10,663,000
Granted			—						135,834						135,834						9.24						7.3						$	259,000
Exercised			(1,160)						(686,178)						(687,338)						2.33
Canceled			(923)						(47,751)						(48,674)						6.03
Forfeited			—						(12,000)						(12,000)						7.48
Expired			(5,834)						—						(5,834)						10.80
Outstanding, April 30, 2021			35,415						1,618,231						1,653,646						3.96						5.4						$	11,384,000
Vested and expected to vest as of April 30, 2021			35,415						1,618,231						1,653,646						3.96						5.4						$	11,384,000
Vested as of April 30, 2021			9,584						1,323,270						1,332,854						3.34						4.8						$	9,995,000

			Non- Employees						Directors and Employees						Total						Weighted Average Exercise Price						Weighted Average Remaining Contractual Life (Years)						Aggregate Intrinsic Value
Outstanding, May 1, 2019			50,000						2,373,626						2,423,626						$	3.19					5.3						$	14,557,000
Granted			—						229,833						229,833						5.33						8.1						544,000
Exercised			—						(248,495)						(248,495)						2.31
Canceled			—						(11,824)						(11,824)						7.96
Forfeited			—						(44,813)						(44,813)						7.85
Expired			(6,668)						(70,001)						(76,669)						8.04
Outstanding, April 30, 2020			43,332						2,228,326						2,271,658						3.23						5.0						$	10,663,000
Vested and expected to vest as of April 30, 2020			43,332						2,228,326						2,271,658						3.23						5.0						$	10,663,000
Vested as of April 30, 2020			17,501						1,926,117						1,943,618						2.83						4.5						$	9,898,000

Schedule Of Stock-based Compensation Warrants Activity

Activity related to warrants is summarized in the following table. Approximately 161,000 shares noted as exercised below were done so via a cash-less exercise basis.

			Number of Shares						Weighted Average Exercise Price						Weighted Average Remaining Contractual Life (Years)						Aggregate Intrinsic Value
Outstanding, May 1, 2019			1,671,440						$	6.20					0.9						$	5,730,000
Granted			—						—						—						—
Exercised			(858,695)						5.62						—						10,045,000
Forfeited			(760,601)						5.76						—						8,587,000
Expired			(52,144)						4.85						—						700,000
Outstanding, April 30, 2020			—						$	—					—						$	—

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for warrants that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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