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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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