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CONVERTIBLE SENIOR NOTES AND CAPPED CALL - Carrying Amount of the Liability Component (Details) - Convertible Debt - Convertible Senior Notes - USD ($) | Mar. 31, 2020 | Mar. 31, 2019 | Feb. 28, 2019
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Principal | $ 362,500,000 | $ 287,500,000 | $ 287,500,000
Unamortized debt discount | (69,987,000) | (70,876,000) |
Unamortized issuance costs | (976,000) | (589,000) |
Net carrying amount | $ 291,537,000 | $ 216,035,000 |

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