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Stockholders' Equity - Summary of Stock Compensation Expense (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 4,706 | $ 2,357 | [1] | $ 6,947
Cost of sales |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | 740 | 667 |  | 694
Research and development |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | 71 | 79 |  | 62
Selling and marketing |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | 767 | 155 |  | 337
General and administrative |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 3,128 | $ 1,456 |  | $ 5,854
[1] | The decrease in general and administrative stock-based compensation expense from fiscal 2019 was because of the separation of our former President and Chief Executive Officer.

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