FINANCING ARRANGEMENTS - Components of Convertible Notes (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Debt Instrument
Outstanding principal amount	$ 248,675	$ 265,839
Senior Convertible Note
Debt Instrument
Principal amounts at beginning of period	95,178	155,000
Conversion of principal into common stock	0	(59,822)
Outstanding principal amount	95,178	95,178
Unamortized discount and issuance costs	(49,622)	(51,005)
Net carrying amount at end of period	$ 45,556	$ 44,173

The portion of the carrying value of long-term convertible debt as of the balance sheet date that is scheduled to be repaid within one year or in the normal operating cycle if longer. Convertible debt is a financial instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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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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Amount of unamortized debt discount (premium) and debt issuance costs.

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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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