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CONVERTIBLE SENIOR NOTES AND CAPPED CALL - Carrying Amount of the Liability Component (Details) - Convertible Debt - Aggregate Notes - USD ($)	Dec. 31, 2019	Dec. 01, 2019	Mar. 31, 2019
Debt Instrument [Line Items]
Principal	$ 362,500,000	$ 362,500,000	$ 287,500,000
Debt Instrument, Unamortized Premium	1,323,000		0
Unamortized debt discount	(75,315,000)		(70,876,000)
Unamortized issuance costs	(1,043,000)		(589,000)
Net carrying amount	$ 287,465,000		$ 216,035,000

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