CONVERTIBLE NOTES - 5.00% Notes (Narrative) (Details) $ / shares in Units, loan in Millions			1 Months Ended			12 Months Ended
	Dec. 15, 2023 USD ($)	Jun. 09, 2023 USD ($)	Oct. 31, 2023 USD ($) shares	Aug. 31, 2023 USD ($) shares	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) loan	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Oct. 18, 2023 $ / shares	Mar. 13, 2023	Apr. 04, 2018	Mar. 31, 2018 USD ($)
Debt Instrument [Line Items]
2.50% Notes extinguished in connection with exchange transaction						$ 0	$ 49,624,000	$ 0
Paid-in-kind interest						1,718,000	0	0
Equity Option
Debt Instrument [Line Items]
Derivative liability		$ 38,200,000				0	0
5.00% Convertible Notes Due 2026 | Convertible Notes
Debt Instrument [Line Items]
Interest rate		5.00%			5.00%
Total convertible notes					$ 66,900,000	$ 36,102,000	0
Conversion ratio		0.13888889		0.13888889	0.13888889
Initial conversion price (in dollars per share) | $ / shares									$ 7.20
Conversion price premium percent									50.00%
Debt instrument, convertible, number of equity instruments | loan						9.4
Payments of debt issuance costs					$ 3,000,000
Contractual term					3 years 6 months
Effective interest rate					27.30%
Gain on extinguishment of debt					$ 14,100,000
Unamortized debt premium		$ 6,000,000				$ 5,408,000	0
Paid-in-kind interest	$ 1,700,000
Accrued interest						100,000
5.00% Convertible Notes Due 2026 | Convertible Notes | Level 3
Debt Instrument [Line Items]
Fair value		$ 38,200,000				50,800,000
5.00% Convertible Notes Due 2026 | Convertible Notes | Minimum
Debt Instrument [Line Items]
Initial conversion price (in dollars per share) | $ / shares									$ 8.30
2.50% Convertible Notes due 2023 | Convertible Notes
Debt Instrument [Line Items]
Interest rate										2.50%		2.50%
Aggregate principal amount					10,000,000							$ 150,000,000
Total convertible notes					66,900,000	726,000	56,413,000
Contractual term											5 years
Gain on extinguishment of debt							$ 3,600,000	$ 4,900,000
June 2023 Exchange Transaction | 5.00% Convertible Notes Due 2026 | Convertible Notes
Debt Instrument [Line Items]
Aggregate principal amount exchanged					56,900,000
Aggregate principal amount					10,000,000
June 2023 Exchange Transaction | 2.50% Convertible Notes due 2023 | Convertible Notes
Debt Instrument [Line Items]
Aggregate principal amount exchanged					$ 55,900,000
Gain on extinguishment of debt						(6,600,000)
August 2023 Conversions | 5.00% Convertible Notes Due 2026 | Convertible Notes
Debt Instrument [Line Items]
Aggregate principal amount exchanged				$ 700,000
Fair value				$ 400,000
Shares issued (in shares) | shares				94,000
2.50% Notes extinguished in connection with exchange transaction				$ 300,000
Gain on extinguishment of debt						$ 100,000
October 2023 Conversions | 5.00% Convertible Notes Due 2026 | Convertible Notes
Debt Instrument [Line Items]
Aggregate principal amount exchanged			$ 300,000
Shares issued (in shares) | shares			39,000
2.50% Notes extinguished in connection with exchange transaction			$ 100,000