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INCOME TAXES - Reconciliation of Taxes Provided to Federal Statutory Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Tax benefit at statutory rate	$ (36,909)	$ (34,492)	$ (36,163)
State income taxes before valuation allowance, net of federal effect	(7,754)	(7,445)	(7,680)
Foreign tax rate differential	(2,056)	(2,206)	(1,422)
Research and development credits	(3,362)	(4,078)	(3,892)
Change in valuation allowance	49,620	47,225	51,741
Compensation/option differences	(6,788)	(5,045)	(6,584)
Non-deductible compensation	7,606	6,194	3,017
Other	(744)	690	1,815
Total income tax provision (benefit)	$ (387)	$ 843	$ 832

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