11. STOCK-BASED COMPENSATION (Tables)
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12 Months Ended |
Mar. 31, 2026 |
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| STOCK-BASED COMPENSATION |
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| 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 | | | Intrinsic | | | Grant | | Outstanding | | Life (Years) | | Price | | Value Per Share | | | Value | Balance, March 31, 2025 | | 3,095,976 | | 7,636,716 | | | | $ | 5.03 | | $ | 2.11 | | | | Granted | | (1,356,109) | | 1,356,109 | | | | $ | 5.48 | | $ | 4.42 | | | | Exercised | | — | | (1,309,800) | | | | $ | 4.42 | | $ | 1.77 | | $ | 5,444,443 | Forfeited | | 223,528 | | (597,891) | | | | $ | 4.69 | | $ | 1.95 | | | | Balance at March 31, 2026 | | 1,963,395 | | 7,085,134 | | 5.74 | | $ | 5.25 | | $ | 2.63 | | $ | 5,852,486 | Options vested and exercisable | | | | 4,636,645 | | 4.34 | | $ | 5.59 | | $ | 2.26 | | $ | 3,050,272 | Options vested and expected to vest | | | | 7,037,592 | | 5.72 | | $ | 5.26 | | $ | 2.63 | | $ | 5,778,180 | Options unvested | | | | 2,448,489 | | 8.39 | | $ | 4.60 | | $ | 3.33 | | $ | 2,802,215 |
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| Schedule of options outstanding by exercise price |
| | | | | | | | | | | | | | | | | | | | | Number of | | Options Outstanding | | Options Exercisable | | | | | | Shares | | Weighted | | Weighted Average | | | | Weighted | | | | | | Underlying | | Average | | Remaining | | Number | | Average | | | | | | Options | | Exercise | | Contractual | | Vested and | | Exercise | Exercise Price | | Outstanding | | Price | | Life (Years) | | Exercisable | | Price | $ | 0.00 | - | 2.00 | | 600,960 | | $ | 1.91 | | 7.42 | | 493,593 | | $ | 1.91 | $ | 2.01 | - | 4.00 | | 1,687,530 | | $ | 3.31 | | 8.46 | | 626,614 | | $ | 3.08 | $ | 4.01 | - | 6.00 | | 2,205,759 | | $ | 5.05 | | 5.03 | | 1,467,109 | | $ | 5.45 | $ | 6.01 | - | 8.00 | | 1,830,496 | | $ | 7.02 | | 4.03 | | 1,428,886 | | $ | 6.97 | $ | 8.01 | - | 10.00 | | 760,389 | | $ | 8.51 | | 4.51 | | 620,443 | | $ | 8.24 | | | | | | 7,085,134 | | $ | 5.25 | | 5.74 | | 4,636,645 | | $ | 5.59 |
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| Summary of stock-based compensation expense by line item |
| | | | | | | | | | | | | Year Ended March 31, | | | | 2026 | | 2025 | | 2024 | | | | | (In thousands) | | Cost of revenues | | $ | 231 | | $ | 199 | | $ | 228 | | Research and development | | | 945 | | | 1,010 | | | 1,411 | | Selling, general and administrative | | | 1,627 | | | 1,053 | | | 1,199 | | | | $ | 2,803 | | $ | 2,262 | | $ | 2,838 | |
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| Schedule of weighted average assumptions |
| | | | | | | | | | | | | | | | Year Ended March 31, | | | | 2026 | | 2025 | | 2024 | | Stock Option Plans: | | | | | | | | | | | | | | Risk-free interest rate | | 3.90 | - | 4.14 | % | 4.05 | - | 4.48 | % | 3.69 | - | 4.80 | % | Expected life (in years) | | 7.07 | - | 7.30 | | 4.89 | - | 5.00 | | 4.46 | - | 4.94 | | Volatility | | 84.4 | - | 96.7 | % | 91.0 | - | 96.7 | % | 80.7 | - | 85.9 | % | Dividend yield | | | | — | % | | | — | % | | | — | % | Employee Stock Purchase Plan: | | | | | | | | | | | | | | Risk-free interest rate | | 3.81 | - | 4.30 | % | 4.44 | - | 5.41 | % | 5.26 | - | 5.38 | % | Expected life (in years) | | | | 0.50 | | | | 0.50 | | | | 0.50 | | Volatility | | 27.1 | - | 34.4 | % | 6.1 | - | 12.4 | % | 28.8 | - | 83.9 | % | Dividend yield | | | | — | % | | | — | % | | | — | % |
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