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INCOME TAXES - Reconciliation of Taxes Provided to Federal Statutory Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Tax benefit at statutory rate	$ (18,441)	$ (11,790)	$ (1,652)
State income taxes before valuation allowance, net of federal effect	(3,612)	(1,042)	108
Foreign tax rate differential	71	(1,188)	885
Research and development credits	(3,744)	(2,189)	(1,484)
Change in valuation allowance	30,558	56,663	(287)
Compensation/option differences	(7,277)	(4,965)	(246)
Non-deductible compensation	1,200	1,132	1,079
Tax Act rate change impact	0	22,630	0
Acquisition costs	0	0	54
Foreign loss not benefited	159	6,847	780
Other	1,655	196	637
Total income tax provision (benefit)	$ 569	$ 66,294	$ (126)

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