10. STOCK-BASED COMPENSATION - Stock-based compensation expense (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Stock-based compensation expense by line item | ||
| Stock-based compensation expense | $ 887 | $ 341 |
| Cost of revenues | ||
| Stock-based compensation expense by line item | ||
| Stock-based compensation expense | 70 | 44 |
| Research and development | ||
| Stock-based compensation expense by line item | ||
| Stock-based compensation expense | 260 | (62) |
| Selling, general and administrative | ||
| Stock-based compensation expense by line item | ||
| Stock-based compensation expense | $ 557 | $ 359 |