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Stock-Based Payments - Narrative (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 28 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 31, 2025 USD ($) $ / shares shares | Jul. 31, 2024 USD ($) $ / shares | Jul. 31, 2025 USD ($) $ / shares shares | Apr. 30, 2025 shares | Mar. 29, 2023 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total stock-based compensation expense | $ | $ 208 | $ 258 |  |  |
Weighted-average grant date fair value (in dollars per share) | $ / shares | $ 4.33 | $ 3.02 |  |  |
Share repurchase program, authorized amount | $ |  |  |  |  | $ 5,000
Treasury stock (in shares) | shares |  |  | 120,300 |  |
Treasury stock average price (in dollars per share) | $ / shares |  |  | $ 5.73 |  |
Treasury stock approximate value | $ |  |  | $ 708 |  |
Remaining repurchase amount | $ | $ 4,300 |  | $ 4,300 |  |
2023 Global Equity Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expiration term of awards | 10 years |  |  |  |
Options granted outstanding (in shares) | shares | 300 |  | 300 | 0 |
Weighted-average grant date fair value (in dollars per share) | $ / shares | $ 1,364 |  |  |  |
2023 Global Equity Incentive Plan | Share-Based Payment Arrangement, Tranche One |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage | 25.00% |  |  |  |
2023 Global Equity Incentive Plan | Share-Based Payment Arrangement, Tranche Two |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage | 6.25% |  |  |  |
2023 Global Equity Incentive Plan | Share-Based Payment Arrangement, After Tranche One |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period | 3 years |  |  |  |
Equity Incentive Plan 2021 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares available for grant (in shares) | shares | 342,000 |  | 342,000 |  |
Expiration term of awards | 10 years |  |  |  |
Strike price as a percent of fair market value | 1 |  |  |  |
Equity Incentive Plan 2021 | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares available for grant (in shares) | shares | 2,000,000 |  | 2,000,000 |  |
Equity Incentive Plan 2010 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expiration term of awards | 10 years |  |  |  |
Strike price as a percent of fair market value | 1 |  |  |  |
Options granted outstanding (in shares) | shares | 885,000 |  | 885,000 |  |
Equity Incentive Plan 2010 | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares available for grant (in shares) | shares | 30,000,000 |  | 30,000,000 |  |
Research and development |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total stock-based compensation expense | $ | $ 32 | $ 4 |  |  |
Research and development | 2023 Global Equity Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total stock-based compensation expense | $ | $ 30,000 |  |  |  |

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