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Amount of common stock allocated to investors to buy shares of a new issue of common stock before they are offered to the public. When stock is sold on a subscription basis, the issuer does not initially receive the total proceeds. In general, the issuer does not issue the shares to the investor until it receives the entire proceeds.

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Monetary value of common stock allocated to investors to buy shares of a new issue of common stock before they are offered to the public. When stock is sold on a subscription basis, the issuer does not initially receive the total proceeds. In general, the issuer does not issue the shares to the investor until it receives the entire proceeds.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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CONVERTIBLE NOTES - Restructuring Support Agreement and June 2023 Exchange Transactions (Narrative) (Details) - USD ($) shares in Millions	1 Months Ended		12 Months Ended
	Jun. 30, 2023	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jun. 09, 2023	Mar. 13, 2023	Mar. 31, 2018
Debt Instrument [Line Items]
Accrued interest, related-party			$ 0	$ 663,000
Affiliated Entity \| Jack W. Schuler Living Trust \| Restructuring Support Agreement
Debt Instrument [Line Items]
Public offering backstop	$ 10,000,000					$ 10,000,000
Aggregate purchase price						10,000,000
Affiliated Entity \| Jack W. Schuler Living Trust \| March 2022 Securities Purchase Agreement
Debt Instrument [Line Items]
Agreement to purchase shares (in shares)	0.5
Affiliated Entity \| Jack W. Schuler Living Trust \| Private Placement \| March 2022 Securities Purchase Agreement
Debt Instrument [Line Items]
Agreement to purchase shares (in shares)		0.2
Proceeds from issuance of common stock to related party	$ 4,000,000	$ 4,000,000
Aggregate purchase price		$ 4,000,000
Affiliated Entity \| Common Shares \| Jack W. Schuler Living Trust \| Restructuring Support Agreement
Debt Instrument [Line Items]
Aggregate purchase price	10,000,000
2.50% Convertible Notes due 2023 \| Convertible Notes
Debt Instrument [Line Items]
Interest rate							2.50%	2.50%
Accrued interest, related-party						$ 1,000,000
Aggregate principal amount	$ 10,000,000							$ 150,000,000
Loss on extinguishment				$ (3,600,000)	$ (4,900,000)
5.00% Convertible Notes Due 2026 \| Convertible Notes
Debt Instrument [Line Items]
Interest rate	5.00%					5.00%
Loss on extinguishment	$ (14,100,000)
June 2023 Exchange Transaction \| Senior Notes \| Series A Preferred Stock
Debt Instrument [Line Items]
Shares issued (in shares)	0.4
June 2023 Exchange Transaction \| Senior Notes \| Affiliated Entity
Debt Instrument [Line Items]
Shares issued (in shares)	3.4
June 2023 Exchange Transaction \| 2.50% Convertible Notes due 2023 \| Convertible Notes
Debt Instrument [Line Items]
Aggregate principal amount exchanged	$ 55,900,000
Accrued interest, related-party	1,000,000
Loss on extinguishment			$ 6,600,000
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