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10. STOCK-BASED COMPENSATION (Tables) | 6 Months Ended
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Sep. 30, 2025
STOCK-BASED COMPENSATION |
Summary of stock option activities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Number of Shares | ​ | Average | ​ | Weighted | ​ | ​ | Weighted
​ | ​ | Shares | ​ | Underlying | ​ | Remaining | ​ | Average | ​ | ​ | Average Grant
​ | ​ | Available for | ​ | Options | ​ | Contractual | ​ | Exercise | ​ | Date Fair
​ |  | Grant |  | Outstanding |  | Life (Years) |  | Price |  | Value Per Share
Balance at March 31, 2025 | ​ | 3,095,976 | ​ | 7,636,716 | ​ | ​ | ​ | $ | 5.03 | ​ | $ | 2.11
Granted | ​ | (809,103) | ​ | 809,103 | ​ | ​ | ​ | $ | 3.85 | ​ | $ | 3.01
Exercised | ​ | — | ​ | (13,375) | ​ | ​ | ​ | $ | 3.02 | ​ | $ | 1.15
Forfeited | ​ | 67,578 | ​ | (413,066) | ​ | ​ | ​ | $ | 4.76 | ​ | $ | 1.75
Balance at September 30, 2025 | ​ | 2,354,451 | ​ | 8,019,378 | ​ | 5.45 | ​ | $ | 4.92 | ​ | $ | 2.22
Options vested and exercisable | ​ | ​ | ​ | 5,640,995 | ​ | 4.12 | ​ | $ | 5.46 | ​ | $ | 2.12
Options vested and expected to vest | ​ | ​ | ​ | 7,966,254 | ​ | 5.43 | ​ | $ | 4.93 | ​ | $ | 2.22
Options unvested | ​ | ​ | ​ | 2,378,383 | ​ | 8.60 | ​ | $ | 3.66 | ​ | $ | 2.46
Summary of stock-based compensation expense by line item | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Six Months Ended September 30,
​ | ​ | 2025 | ​ | 2024 | ​ | 2025 | ​ | 2024
​ | ​ | (In thousands) | ​ | (In thousands)
Cost of revenues | ​ | $ | 58 | ​ | $ | 51 | ​ | $ | 102 | ​ | $ | 107
Research and development | ​ | ​ | 303 | ​ | ​ | 336 | ​ | ​ | 241 | ​ | ​ | 626
Selling, general and administrative | ​ | ​ | 495 | ​ | ​ | 276 | ​ | ​ | 854 | ​ | ​ | 588
​ | ​ | $ | 856 | ​ | $ | 663 | ​ | $ | 1,197 | ​ | $ | 1,321
​

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