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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Level 3 Unobservable Inputs (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Jun. 30, 2023 | Sep. 30, 2022
Recurring Fair Value Measurements |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | $ 35,001 | $ 33,000
Level 3 |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Discount rate | 22.40% |
Risk-free rate | 4.00% |
Equity volatility | 92.50% |
Level 3 | Recurring Fair Value Measurements |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | $ 35,001 | $ 33,000

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