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CONVERTIBLE SENIOR NOTES AND CAPPED CALL - Carrying Amount of the Liability Component (Details) - Convertible Debt - Aggregate Notes - USD ($) | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 01, 2019
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Principal | $ 362,500,000 | $ 362,500,000 | $ 362,500,000
Unamortized debt discount | (65,919,000) | (69,987,000) |
Unamortized issuance costs | (919,000) | (976,000) |
Net carrying amount | $ 295,662,000 | $ 291,537,000 |

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