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INCOME TAXES - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Income Taxes [Line Items] |  |  |
Net increase (decrease) in total valuation allowance | $ 1,600,000 |  |
Income tax provision | (4,187,000) | $ 2,314,000 | $ (92,000)
Income tax benefit from release of valuation allowance | 1,696,000 | 292,000 | (1,702,000)
Unrecognized tax benefits that will impact the company's effective tax rate | 2,500,000 |  |
Unrecognized tax benefits, income tax penalties and interest expense | 100,000 | 0 | $ 0
Accrued interest or penalties related to uncertain tax positions | 100,000 | $ 0 |
Federal |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carryforwards | 0 |  |
Federal | Research and Development Tax Credit |  |  |
Income Taxes [Line Items] |  |  |
Tax credit carryforwards | 0 |  |
State |  |  |
Income Taxes [Line Items] |  |  |
Net operating losses subject to expiration | 24,300,000 |  |
State | Research and Development Tax Credit | California |  |  |
Income Taxes [Line Items] |  |  |
Tax credit carryforwards | 3,700,000 |  |
Foreign Tax Jurisdiction |  |  |
Income Taxes [Line Items] |  |  |
Income tax benefit from release of valuation allowance | 1,600,000 |  |
Foreign Tax Jurisdiction | Research and Development Tax Credit |  |  |
Income Taxes [Line Items] |  |  |
Tax credit carryforwards | $ 1,700,000 |  |

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