INCOME TAXES - Narrative (Details) - USD ($)		12 Months Ended
	Jun. 09, 2023	Dec. 31, 2024	Dec. 31, 2023	Aug. 31, 2024	Jul. 31, 2024	Aug. 31, 2023	Jul. 31, 2023	Jun. 30, 2023	Mar. 15, 2023	Dec. 31, 2022	Mar. 31, 2018
Operating Loss Carryforwards [Line Items]
Valuation allowance		$ (150,283,000)	$ (140,104,000)
Change in valuation allowance		10,200,000
Valuation allowance, increase in deferred tax expense		10,800,000
Valuation allowance increase in other comprehensive loss		700,000
Debt discount, deferred tax liability		4,781,000	7,785,000
Valuation allowance, decrease recorded to equity		6,800,000
Uncertain tax positions that would impact the effective tax rate		0
Unrecognized tax benefits		9,133,000	8,844,000							$ 13,596,000
Interest and penalties		0	100,000
Payments on accrued interest and penalties		0	100,000
R&D tax incentive		$ 2,277,000	$ 1,122,000		$ 1,200,000		$ 1,100,000
2.50% Convertible Notes due 2023 | Convertible Notes
Operating Loss Carryforwards [Line Items]
Interest rate (as a percent)			2.50%						2.50%		2.50%
Accrued interest, related-party	$ 1,000,000
Aggregate principal amount			$ 700,000								$ 150,000,000
2.50% Convertible Notes due 2023 | Convertible Notes | Restructuring Support Agreement
Operating Loss Carryforwards [Line Items]
Aggregate principal amount exchanged	55,900,000
2.50% Notes extinguished in connection with exchange transaction	$ 56,900,000
5.00% Convertible Notes Due 2026 | Convertible Notes
Operating Loss Carryforwards [Line Items]
Interest rate (as a percent)	5.00%	5.00%	5.00%	5.00%		5.00%		5.00%
Loss on extinguishment of debt			$ 14,100,000
Aggregate principal amount								$ 10,000,000
Embedded derivative and related debt discount								38,200,000
Embedded derivative liability, deferred tax asset								9,500,000
Debt discount, deferred tax liability								$ 9,500,000
5.00% Convertible Notes Due 2026 | Convertible Notes | Restructuring Support Agreement
Operating Loss Carryforwards [Line Items]
Aggregate principal amount	$ 10,000,000
Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		$ 403,100,000
Operating loss carryforwards, subject to expiration		156,900,000
Operating loss carryforwards, not subject to expiration		246,200,000
Federal | R&D tax credits
Operating Loss Carryforwards [Line Items]
Tax credits		16,200,000
State
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		398,200,000
State | R&D tax credits
Operating Loss Carryforwards [Line Items]
Tax credits		$ 14,200,000