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CONVERTIBLE NOTES - Summary of Interest Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Debt Disclosure [Abstract] |  |  |  |
Debt issuance costs amortization | $ 1,329 | $ 1,444 | $ 4,021 | $ 4,284
Debt discount amortization | 25 | 37 | 81 | 110
Gain on settlements of convertible notes, net | 0 | 0 | (10,324) | 0
Coupon interest expense | 4,906 | 2,566 | 13,166 | 7,699
Total interest expense (income) on convertible notes | $ 6,260 | $ 4,047 | $ 6,944 | $ 12,093

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