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INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Deferred tax assets
Net operating loss carryforwards	$ 145,655	$ 109,734
Research and development and other credit carryforwards	22,794	19,413
Stock-based compensation	12,669	10,343
Reserves and allowances	6,198	3,974
Lease liability	22,424	24,492
Fixed assets and intangibles	6,091	5,314
Gross deferred tax assets	215,831	173,270
Valuation allowance	(160,450)	(115,435)
Total deferred tax assets	55,381	57,835
Deferred tax liabilities
Deferred sales commissions	(27,166)	(21,608)
Convertible debt	(12,695)	(16,626)
Lease asset	(15,520)	(19,601)
Net deferred taxes	$ 0	$ 0

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