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Stock-based Payments (Tables) | 12 Months Ended
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Apr. 30, 2022
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,
| 2022 |  | 2021
General and administrative | $ | 563 |  |  | $ | 292 |
Sales and marketing | 189 |  |  | 199 |
Research and development | 18 |  |  | 23 |
TOS cost of sales | 142 |  |  | 84 |
Total stock-based compensation expense | $ | 912 |  |  | $ | 598 |
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.
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, 2022 and 2021 were as follows:
| Year Ended April 30,
| 2022 |  | 2021
Expected term in years | 6 |  | 3 - 6
Risk-free interest rates | 0.8% - 1.2% |  | 0.1% - 0.5%
Volatility | 64% - 66% |  | 70% - 75%
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, 2022 and 2021 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, 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 |
Vested as of April 30, 2022 | 1,349,895 |  |  | 4,584 |  |  | 1,354,479 |  |  | 3.93 |  |  | 4.2 |  | $ | 5,778,000 |
| Directors and Employees |  | Non- Employees |  | Total |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value
Outstanding, May 1, 2020 | 2,228,326 |  |  | 43,332 |  |  | 2,271,658 |  |  | $ | 3.23 |  |  | 5.0 |  | $ | 10,663,000 |
Granted | 135,834 |  |  | — |  |  | 135,834 |  |  | 9.24 |  |  | 7.3 |  | 259,000 |
Exercised | (686,178) |  |  | (1,160) |  |  | (687,338) |  |  | 2.33 |  |  |  |  |
Canceled | (47,751) |  |  | (923) |  |  | (48,674) |  |  | 6.03 |  |  |  |  |
Forfeited | (12,000) |  |  | — |  |  | (12,000) |  |  | 7.48 |  |  |  |  |
Expired | — |  |  | (5,834) |  |  | (5,834) |  |  | 10.80 |  |  |  |  |
Outstanding, April 30, 2021 | 1,618,231 |  |  | 35,415 |  |  | 1,653,646 |  |  | 3.96 |  |  | 5.4 |  | $ | 11,384,000 |
Vested and expected to vest as of April 30, 2021 | 1,618,231 |  |  | 35,415 |  |  | 1,653,646 |  |  | 3.96 |  |  | 5.4 |  | $ | 11,384,000 |
Vested as of April 30, 2021 | 1,323,270 |  |  | 9,584 |  |  | 1,332,854 |  |  | 3.34 |  |  | 4.8 |  | $ | 9,995,000 |

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