10. STOCK-BASED COMPENSATION - Stock option activities (Details)	3 Months Ended
	Jun. 30, 2024 USD ($) $ / shares shares
STOCK-BASED COMPENSATION
Shares available for grant, Beginning	2,584,186
Granted (in shares)	(80,210)
Forfeited (in shares)	119,875
Shares available for grant, Ending	2,623,851
Number of Shares Underlying Options Outstanding
Balance at the beginning of the period (in shares)	8,968,199
Granted (in shares)	80,210
Exercised (in shares)	(3,000)
Forfeited (in shares)	(139,775)
Balance at the end of the period (in shares)	8,905,634
Options vested and exercisable (in shares)	6,426,713
Options vested and expected to vest (in shares)	8,842,029
Weighted Average Remaining Contractual Life
Options weighted average remaining contractual life	5 years 4 months 28 days
Options vested and exercisable	4 years 2 months 23 days
Options vested and expected to vest	5 years 4 months 20 days
Weighted Average Exercise Price
Balance at the beginning of the period (in dollars per share) | $ / shares	$ 5.26
Granted (in dollars per share) | $ / shares	3.10
Exercised (in dollars per share) | $ / shares	1.98
Forfeited (in dollars per share) | $ / shares	4.63
Balance at the end of the period (in dollars per share) | $ / shares	5.25
Options vested and exercisable (in dollars per share) | $ / shares	5.79
Options vested and expected to vest (in dollars per share) | $ / shares	$ 5.26
Intrinsic Value
Exercised (in dollars) | $	$ 3,341
Options vested and exercisable (in dollars) | $	275,591
Options vested and expected to vest (in dollars) | $	$ 800,515