CONVERTIBLE NOTES - Schedule of Future Principal Payments (Details) - Convertible Notes - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Net carrying amount	$ 34,053	$ 56,413
5.00% Convertible Notes Due 2026
Debt Instrument [Line Items]
Remainder of 2023	0
2024	0
2025	0
2026	78,124
Total including PIK interest, before unamortized discount and issuance costs	78,124
Less: unaccrued PIK interest	(11,905)
Less: unamortized discount and deferred issuance costs	(32,892)
Net carrying amount	$ 33,327	$ 0

Debt Instrument, Unpaid In Kind Interest

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Long-Term Debt, Including Accrued Interest

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

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

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