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CONVERTIBLE SENIOR NOTES AND CAPPED CALL - Interest Expense (Details) - Convertible Debt - Aggregate Notes - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019
Debt Instrument [Line Items] |  |
Contractual interest expense | $ 400 | $ 1,119
Amortization of debt premium | (31) | 0
Amortization of debt discount | 3,582 | 9,926
Amortization of issuance costs | 40 | 92
Total interest expense | $ 3,991 | $ 11,137

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