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10. STOCK-BASED COMPENSATION - Stock option activities (Details)
 6 Months Ended
Sep. 30, 2025
USD ($)
$ / shares
shares
STOCK-BASED COMPENSATION  
Shares available for grant, Beginning | shares 3,095,976
Granted (in shares) | shares (809,103)
Forfeited (in shares) | shares 67,578
Shares available for grant, Ending | shares 2,354,451
Number of Shares Underlying Options Outstanding  
Balance at the beginning of the period (in shares) | shares 7,636,716
Granted (in shares) | shares 809,103
Exercised (in shares) | shares (13,375)
Forfeited (in shares) | shares (413,066)
Balance at the end of the period (in shares) | shares 8,019,378
Options vested and exercisable (in shares) | shares 5,640,995
Options vested and expected to vest (in shares) | shares 7,966,254
Options unvested (in shares) | shares 2,378,383
Weighted Average Remaining Contractual Life  
Options weighted average remaining contractual life 5 years 5 months 12 days
Options vested and exercisable 4 years 1 month 13 days
Options vested and expected to vest 5 years 5 months 4 days
Options unvested 8 years 7 months 6 days
Weighted Average Exercise Price  
Balance at the beginning of the period (in dollars per share) $ 5.03
Granted (in dollars per share) 3.85
Exercised (in dollars per share) 3.02
Forfeited (in dollars per share) 4.76
Balance at the end of the period (in dollars per share) 4.92
Options vested and exercisable (in dollars per share) 5.46
Options vested and expected to vest (in dollars per share) 4.93
Options unvested (in dollars per share) 3.66
Weighted Average Grant Date Fair Value Per Share  
Balance at the beginning of the period (in dollars per share) 2.11
Granted (in dollars per share) 3.01
Exercised (in dollars per share) 1.15
Forfeited (in dollars per share) 1.75
Balance at the end of the period (in dollars per share) 2.22
Options vested and exercisable (in dollars per share) 2.12
Options vested and expected to vest (in dollars per share) 2.22
Options unvested (in dollars per share) $ 2.46
Intrinsic Value  
Aggregate intrinsic value of options exercised | $ $ 10,471