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