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10. STOCK-BASED COMPENSATION - Stock option activities (Details)
 6 Months Ended
Sep. 30, 2023
USD ($)
$ / shares
shares
STOCK-BASED COMPENSATION  
Shares available for grant, Beginning 3,594,851
Granted (in shares) (639,053)
Forfeited (in shares) 121,062
Shares available for grant, Ending 3,076,860
Number of Shares Underlying Options Outstanding  
Balance at the beginning of the period (in shares) 8,809,160
Granted (in shares) 639,053
Exercised (in shares) (235,888)
Forfeited (in shares) (580,193)
Balance at the end of the period (in shares) 8,632,132
Options vested and exercisable (in shares) 5,495,970
Options vested and expected to vest (in shares) 8,531,774
Weighted Average Remaining Contractual Life  
Options weighted average remaining contractual life 5 years 9 months 7 days
Options vested and exercisable 4 years 2 months 15 days
Options vested and expected to vest 5 years 9 months
Weighted Average Exercise Price  
Balance at the beginning of the period (in dollars per share) | $ / shares $ 5.62
Granted (in dollars per share) | $ / shares 4.55
Exercised (in dollars per share) | $ / shares 5.13
Forfeited (in dollars per share) | $ / shares 6.23
Balance at the end of the period (in dollars per share) | $ / shares 5.51
Options vested and exercisable (in dollars per share) | $ / shares 6.04
Options vested and expected to vest (in dollars per share) | $ / shares $ 5.53
Intrinsic Value  
Exercised (in dollars) | $ $ 313,926
Options vested and exercisable (in dollars) | $ 148,839
Options vested and expected to vest (in dollars) | $ $ 431,582