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CONVERTIBLE SENIOR NOTES - Interest Costs Recognized on 2026 Notes (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Total interest expense recognized	$ 2,263	$ 2,137
Convertible Debt | 2026 Notes
Debt Instrument [Line Items]
Contractual interest expense	293	293
Amortization of debt discount and issuance costs	1,970	1,844
Total interest expense recognized	$ 2,263	$ 2,137

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Amount of amortization expense attributable to debt issuance costs.

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