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DEBT - Convertible Senior Notes due 2023 (Details) - Convertible Senior Notes Due 2023		1 Months Ended	12 Months Ended
	Jun. 05, 2019 USD ($) shares	Aug. 31, 2018 USD ($) $ / shares	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Conversion shares (in shares) \| shares	10,801,080
Fees paid for repurchase and exchange of convertible notes	$ 6,000,000.0		$ 6,000,000.0
Convertible Notes
Debt Instrument [Line Items]
Debt instrument face amount		$ 65,000,000.0	5,000,000.0
Interest rate		4.00%
Debt converted	$ 60,000,000.0
Debt conversion price (in USD per share) \| $ / shares		$ 5.56
Redemption price percentage		100.00%
Conversion ratio		0.180018
Reclassification Adjustment \| Convertible Notes
Debt Instrument [Line Items]
Deferred issuance costs			2,000,000.0
Accrued interest			$ 800,000