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INCOME TAXES - Reconciliation of Taxes Provided to Federal Statutory Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Tax benefit at statutory rate	$ (34,492)	$ (36,163)	$ (18,441)
State income taxes before valuation allowance, net of federal effect	(7,445)	(7,680)	(3,612)
Foreign tax rate differential	(2,206)	(1,422)	71
Research and development credits	(4,078)	(3,892)	(3,744)
Change in valuation allowance	47,225	51,741	30,558
Compensation/option differences	(5,045)	(6,584)	(7,277)
Non-deductible compensation	6,194	3,017	1,200
Other	690	1,815	1,814
Total income tax provision (benefit)	$ 843	$ 832	$ 569

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