DEBT - Schedule of Interest Cost Recognized In Statements Of Operations (Details) - Convertible Notes - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Notes due 2028
Debt Instrument [Line Items]
Amortization of debt issuance costs	$ 327	$ 327	$ 970	$ 969
Total interest cost recognized	327	327	970	969
Notes due 2026
Debt Instrument [Line Items]
Amortization of debt issuance costs	502	502	1,489	1,489
Total interest cost recognized	502	502	1,489	1,489
Notes due 2025
Debt Instrument [Line Items]
Contractual interest expense	64	64	192	192
Amortization of debt discount	1,161	1,103	3,410	3,239
Amortization of debt issuance costs	122	122	363	363
Total interest cost recognized	1,347	1,289	3,965	3,794
Notes due 2023
Debt Instrument [Line Items]
Contractual interest expense	17	50	117	150
Amortization of debt issuance costs	3	10	23	30
Total interest cost recognized	$ 20	$ 60	$ 140	$ 180

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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