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DEBT - Proposed Offering of Convertible Senior Note (Details) - Convertible Senior Notes due 2023 - USD ($)	Nov. 13, 2018	Dec. 31, 2018
Debt Instrument [Line Items]
Incurred professional fees		$ 1,000,000
Convertible debt
Debt Instrument [Line Items]
Aggregate principal amount	$ 150,000,000.0
Number of days for option	30 days
Additional aggregate principal amount	$ 25,000,000.0

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received.

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

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