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INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019
Deferred tax assets
Net operating loss carryforwards	$ 109,734	$ 61,740
Research and development and other credit carryforwards	19,413	15,573
Stock-based compensation	10,343	9,006
Reserves and allowances	3,974	5,697
Lease liability	24,492
Fixed assets and intangibles	5,314	2,709
Gross deferred tax assets	173,270	94,725
Valuation allowance	(115,435)	(65,948)
Total deferred tax assets	57,835	28,777
Deferred tax liabilities
Deferred sales commissions	(21,608)	(12,221)
Convertible debt	(16,626)	(16,556)
Lease asset	(19,601)
Net deferred taxes	$ 0	$ 0

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