11. STOCK-BASED COMPENSATION - Stock option activities (Details) - $ / shares	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
STOCK-BASED COMPENSATION
Shares available for grant, Beginning	2,584,186
Granted (in shares)	(831,635)
Forfeited (in shares)	1,343,425
Shares available for grant, Ending	3,095,976	2,584,186
Number of Shares Underlying Options Outstanding
Balance at the beginning of the period (in shares)	8,968,199
Granted (in shares)	831,635
Exercised (in shares)	(73,730)
Forfeited (in shares)	(2,089,388)
Balance at the end of the period (in shares)	7,636,716	8,968,199
Options vested and exercisable (in shares)	5,480,321
Options vested and expected to vest (in shares)	7,585,284
Options unvested (in shares)	2,179,020
Weighted Average Remaining Contractual Life
Options weighted average remaining contractual life	5 years 4 months 17 days
Options vested and exercisable	4 years 3 months 10 days
Options vested and expected to vest	5 years 4 months 9 days
Options unvested	8 years 1 month 28 days
Weighted Average Exercise Price
Balance at the beginning of the period (in dollars per share)	$ 5.26
Granted (in dollars per share)	3.08
Exercised (in dollars per share)	2.08
Forfeited (in dollars per share)	5.36
Balance at the end of the period (in dollars per share)	5.03	$ 5.26
Options vested and exercisable (in dollars per share)	5.47
Options vested and expected to vest (in dollars per share)	5.03
Options unvested (in dollars per share)	3.9
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)	2.23	2.13	$ 1.38
Exercised (in dollars per share)	0.99
Forfeited (in dollars per share)	2.19
Balance at the end of the period (in dollars per share)	2.11	$ 2.11
Options vested and exercisable (in dollars per share)	2.07
Options vested and expected to vest (in dollars per share)	2.11
Options unvested (in dollars per share)	$ 2.21