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10. STOCK-BASED COMPENSATION (Tables) | 6 Months Ended
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Sep. 30, 2023
STOCK-BASED COMPENSATION |
Summary of stock option activities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Number of Shares | ​ | Average | ​ | Weighted | ​ | ​ | ​ | ​
​ | ​ | Shares | ​ | Underlying | ​ | Remaining | ​ | Average | ​ | ​ | ​ | ​
​ | ​ | Available for | ​ | Options | ​ | Contractual | ​ | Exercise | ​ | Intrinsic | ​
​ |  | Grant |  | Outstanding |  | Life (Years) |  | Price |  | Value |
Balance at March 31, 2023 | ​ | 3,594,851 | ​ | 8,809,160 | ​ | ​ | ​ | $ | 5.62 | ​ | ​ | ​ | ​
Granted | ​ | (639,053) | ​ | 639,053 | ​ | ​ | ​ | $ | 4.55 | ​ | ​ | ​ | ​
Exercised | ​ | — | ​ | (235,888) | ​ | ​ | ​ | $ | 5.13 | ​ | $ | 313,926 | ​
Forfeited | ​ | 121,062 | ​ | (580,193) | ​ | ​ | ​ | $ | 6.23 | ​ | ​ | ​ | ​
Balance at September 30, 2023 | ​ | 3,076,860 | ​ | 8,632,132 | ​ | 5.77 | ​ | $ | 5.51 | ​ | ​ | ​ | ​
Options vested and exercisable | ​ | ​ | ​ | 5,495,970 | ​ | 4.21 | ​ | $ | 6.04 | ​ | $ | 148,839 | ​
Options vested and expected to vest | ​ | ​ | ​ | 8,531,774 | ​ | 5.75 | ​ | $ | 5.53 | ​ | $ | 431,582 | ​
Summary of stock-based compensation expense by line item | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Six Months Ended September 30, | ​
​ | ​ | 2023 | ​ | 2022 | ​ | 2023 | ​ | 2022 |
​ | ​ | (In thousands) | ​ | (In thousands) | ​
Cost of revenues | ​ | $ | 57 | ​ | $ | 49 | ​ | $ | 124 | ​ | $ | 109 | ​
Research and development | ​ | ​ | 369 | ​ | ​ | 390 | ​ | ​ | 755 | ​ | ​ | 741 | ​
Selling, general and administrative | ​ | ​ | 250 | ​ | ​ | 222 | ​ | ​ | 617 | ​ | ​ | 449 | ​
Total | ​ | $ | 676 | ​ | $ | 661 | ​ | $ | 1,496 | ​ | $ | 1,299 | ​
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