Stock-Based Compensation - Schedule of Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands |
8 Months Ended | 12 Months Ended | |
|---|---|---|---|
Dec. 31, 2025 |
Apr. 30, 2025 |
Apr. 30, 2024 |
|
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | |||
| Stock-based compensation | $ 11,415 | $ 12,291 | $ 21,915 |
| Cost of Revenue [Member] | |||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | |||
| Stock-based compensation | 87 | ||
| Research and Development [Member] | |||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | |||
| Stock-based compensation | 3,896 | 4,959 | 9,305 |
| Selling, General and Administrative [Member] | |||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | |||
| Stock-based compensation | $ 7,432 | $ 7,332 | $ 12,610 |