INCOME TAXES - Reconciliation of Taxes Provided to Federal Statutory Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Income Tax Disclosure [Abstract]
Tax benefit at statutory rate	$ (13,429)	$ (15,075)	$ (36,909)
State income taxes before valuation allowance, net of federal effect	(2,821)	(3,088)	(7,754)
Foreign tax rate differential	(8)	492	(2,056)
Research and development credits	714	(2,513)	(3,362)
Change in valuation allowance	7,908	(1,708)	49,620
Compensation/option differences	8,449	16,858	(6,788)
Non-deductible compensation	2,612	4,397	7,606
Other	217	3,444	(744)
Total income tax provision (benefit)	$ 3,642	$ 2,807	$ (387)