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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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Face (par) amount of debt instrument at time of issuance.

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