BORROWINGS AND COMMON STOCK WARRANTS - Narrative (Details)							1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 01, 2024 USD ($)	Jun. 21, 2024 USD ($) state $ / shares shares	Apr. 08, 2024 USD ($) $ / shares shares	Dec. 27, 2023 USD ($)	Oct. 02, 2023 USD ($) $ / shares shares	Aug. 04, 2023 USD ($) $ / shares shares	Nov. 08, 2024 USD ($) shares	Sep. 30, 2024 USD ($) shares	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) $ / shares shares	Sep. 30, 2023 USD ($)	Oct. 29, 2024 USD ($)	Jan. 02, 2024 USD ($)	Dec. 31, 2023 USD ($)	Mar. 31, 2021 USD ($)
Line of Credit Facility [Line Items]
Short-term borrowings								$ 0		$ 0				$ 303,947,000
Gain on troubled debt restructuring								0	$ 0	$ (30,311,000)	$ 0
Troubled debt restructuring, decrease of basic loss per share (In dollars per share) | $ / shares										$ (3.69)
Troubled debt restructuring, decrease of diluted loss per share (In dollars per share) | $ / shares										$ (3.69)
Additional short-term borrowings										$ 0	50,000,000
Number of tranches | state		4
Warrant liability								22,252,000		22,252,000				13,971,000
Warrant expense (income)								$ 459,000	9,874,000	$ (3,826,000)	9,874,000
Subsequent Event
Line of Credit Facility [Line Items]
Interest on debt instrument (as a percent)												6.00%
2024 NEA Warrantholders Agreement
Line of Credit Facility [Line Items]
Warrants available			$ 6,800,000
Exercise price of warrants (in dollars per share) | $ / shares			$ 0.01
Warrant liability			$ 6,800,000
Warrant available to be issued (in shares) | shares			1,100,000
Fair market value per share (in dollars per share) | $ / shares			$ 6.14
Warrants to purchase our common stock (in shares) | shares			1,113,563
Warrant period								5 years		5 years
2023 Warrantholders Agreement
Line of Credit Facility [Line Items]
Exercise price of warrants (in dollars per share) | $ / shares						$ 0.01
Warrant liability						$ 25,100,000
Warrant available to be issued (in shares) | shares						1,700,000
Fair market value per share (in dollars per share) | $ / shares						$ 15.12
CalSTRS Warrantholders Agreement
Line of Credit Facility [Line Items]
Exercise price of warrants (in dollars per share) | $ / shares					$ 0.01
Warrant liability					$ 1,000,000
Warrant available to be issued (in shares) | shares					200,000
Fair market value per share (in dollars per share) | $ / shares					$ 5.80
Hercules Warrantholders Agreements
Line of Credit Facility [Line Items]
Exercise price of warrants (in dollars per share) | $ / shares		$ 0.01
Warrant liability		$ 6,400,000
Warrant available to be issued (in shares) | shares		1,300,000
Fair market value per share (in dollars per share) | $ / shares		$ 5.14
Warrants to purchase our common stock (in shares) | shares		1,250,000
Warrantholders Agreement
Line of Credit Facility [Line Items]
Warrant liability								$ 22,300,000		$ 22,300,000				14,000,000
Warrant expense (income)								$ 500,000	9,900,000	$ (3,800,000)	9,900,000
2023 and 2024 Warrantholders Agreement
Line of Credit Facility [Line Items]
Additional warrants issued (in shares) | shares								41,158		41,158
2023 and 2024 Warrantholders Agreement | Subsequent Event
Line of Credit Facility [Line Items]
Additional warrants issued (in shares) | shares							371,188
Centrum Promissory Note | Subsequent Event
Line of Credit Facility [Line Items]
Term loan commitments												$ 64,000,000
Interest on debt instrument (as a percent)												6.00%
Discontinued Operations | California Medicare Advantage Business
Line of Credit Facility [Line Items]
Cash collateralization of existing letters				$ 24,100,000
Revolving Credit Facility | Hercules Warrantholders Credit Agreement
Line of Credit Facility [Line Items]
Revolving credit facility		$ 150,000,000
Short-term borrowings								$ 30,000,000		$ 30,000,000
Effective annual interest rate										18.71%
Debt instrument, unamortized discount		(1,200,000)						(1,100,000)		$ (1,100,000)
Debt instrument, warrant assets		6,400,000						5,300,000		5,300,000
Amortization of debt discount								100,000	0	200,000	0
PIK interest								200,000		200,000
Deferred financing costs								(3,900,000)		(3,900,000)
Unamortized deferred financing costs								(3,700,000)		(3,700,000)
Revolving Credit Facility | Tranche 1
Line of Credit Facility [Line Items]
Term loan commitments		$ 30,000,000
Revolving Credit Facility | Tranche 2
Line of Credit Facility [Line Items]
Term loan commitments								25,000,000		25,000,000
Revolving Credit Facility | Tranche 3
Line of Credit Facility [Line Items]
Term loan commitments								45,000,000		45,000,000
Interest rate reasonable redemption										22,500,000
Revolving Credit Facility | Tranche 4
Line of Credit Facility [Line Items]
Term loan commitments								50,000,000		50,000,000
Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Revolving credit facility															$ 350,000,000
Short-term borrowings								0		$ 0				303,900,000
Effective annual interest rate										5.00%
Letter of credit principal balance								16,500,000		$ 16,500,000
Revolving Credit Facility | Line of Credit | 2023 Credit Agreement
Line of Credit Facility [Line Items]
Debt instrument, periodic payment, interest										12,600,000
Revolving Credit Facility | Letter of Credit
Line of Credit Facility [Line Items]
Letters of credit outstanding								4,900,000		$ 4,900,000
Letter of credit outstanding cash amount percentage										105.00%
Revolving Credit Facility | Letter of Credit | Debt and interest repayment
Line of Credit Facility [Line Items]
Repayments of lines of credit				$ 274,600,000
Short-term borrowings													$ 0
Secured Debt | Line of Credit | Delayed Draw Term Loan
Line of Credit Facility [Line Items]
Revolving credit facility						$ 60,000,000
Term loan commitment increase in an aggregate principal amount					$ 6,400,000
Secured Debt | Line of Credit | 2023 Credit Agreement
Line of Credit Facility [Line Items]
Short-term borrowings								86,400,000		$ 86,400,000				66,400,000
Effective annual interest rate										16.14%
Term loan commitment increase in an aggregate principal amount			$ 30,000,000
Period subsequent to maturity date										91 days
Debt instrument, unamortized discount			$ (4,600,000)					(4,100,000)		$ (4,100,000)				$ 0
Debt instrument, warrant assets								2,300,000		2,300,000
Amortization of debt discount									$ 0	500,000	$ 0
Letter of credit principal balance								$ 10,000,000		$ 10,000,000
Secured Debt | Line of Credit | 2023 Credit Agreement | Subsequent Event
Line of Credit Facility [Line Items]
Additional short-term borrowings	$ 10,000,000						$ 10,000,000