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Stock-based Payments (Tables) | 12 Months Ended
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Apr. 30, 2023
Share-Based Payment Arrangement [Abstract] |
Summary 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,
| 2023 |  | 2022
General and administrative | $ | 505 |  |  | $ | 563 |
Sales and marketing | 192 |  |  | 189 |
Research and development | 19 |  |  | 18 |
TOS cost of sales | 148 |  |  | 142 |
Total stock-based compensation expense | $ | 864 |  |  | $ | 912 |
The Company has in place a 2021 Equity Incentive Plan, 2010 Equity Incentive Plan and 2008 Equity Incentive Plan ("the Plans"). In general, these plans provide for stock-based compensation to the Company’s employees, directors and non-employees. The plans also provide for limits on the aggregate number of shares that may be granted, the term of grants and the strike price of option awards.
Summary 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, 2023 and 2022 were as follows:
| Year Ended April 30,
| 2023 |  | 2022
Expected term in years | 6 |  | 6
Risk-free interest rates | 2.9% - 3.9% |  | 0.8% - 1.2%
Volatility | 61% - 63% |  | 64% - 66%
Dividend yield | 0% |  | 0%
Summary 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, 2023 and 2022 is as follows:
| Directors and Employees |  | Non- Employees |  | Total |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value
Outstanding, May 1, 2022 | 1,617,324 |  |  | 40,915 |  |  | 1,658,239 |  |  | $ | 4.51 |  |  | 4.9 |  | $ | 6,131,000 |
Granted | 186,720 |  |  | — |  |  | 186,720 |  |  | 7.22 |  |  | 9.4 |  | $ | — |
Exercised | (36,209) |  |  | — |  |  | (36,209) |  |  | 3.21 |  |  |  |  |
Canceled | (13,874) |  |  | — |  |  | (13,874) |  |  | 3.93 |  |  |  |  |
Forfeited | (14,625) |  |  | — |  |  | (14,625) |  |  | 7.94 |  |  |  |  |
Expired | — |  |  | (4,584) |  |  | (4,584) |  |  | 5.40 |  |  |  |  |
Outstanding, April 30, 2023 | 1,739,336 |  |  | 36,331 |  |  | 1,775,667 |  |  | 4.80 |  |  | 4.6 |  | $ | 2,683,000 |
Vested and expected to vest as of April 30, 2023 | 1,739,336 |  |  | 36,331 |  |  | 1,775,667 |  |  | 4.80 |  |  | 4.6 |  | $ | 2,683,000 |
Exercisable as of April 30, 2023 | 1,436,932 |  |  | 1,875 |  |  | 1,438,807 |  |  | 4.35 |  |  | 3.8 |  | $ | 2,681,000 |
| Directors and Employees |  | Non- Employees |  | Total |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value
Outstanding, May 1, 2021 | 1,618,231 |  |  | 35,415 |  |  | 1,653,646 |  |  | 3.96 |  | 5.4 |  | $ | 11,384,000 |
Granted | 155,552 |  |  | 10,500 |  |  | 166,052 |  |  | 9.44 |  |  | 9.3 |  | — |
Exercised | (108,375) |  |  | — |  |  | (108,375) |  |  | 2.29 |  |  |  |  |
Canceled | (11,209) |  |  | — |  |  | (11,209) |  |  | 4.71 |  |  |  |  |
Forfeited | (36,875) |  |  | — |  |  | (36,875) |  |  | 7.45 |  |  |  |  |
Expired | — |  |  | (5,000) |  |  | (5,000) |  |  | 9.60 |  |  |  |  |
Outstanding, April 30, 2022 | 1,617,324 |  |  | 40,915 |  |  | 1,658,239 |  |  | 4.51 |  |  | 4.9 |  | $ | 6,131,000 |
Vested and expected to vest as of April 30, 2022 | 1,617,324 |  |  | 40,915 |  |  | 1,658,239 |  |  | 4.51 |  |  | 4.9 |  | $ | 6,131,000 |
Exercisable as of April 30, 2022 | 1,349,895 |  |  | 4,584 |  |  | 1,354,479 |  |  | 3.93 |  |  | 4.2 |  | $ | 5,778,000 |

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