INCOME TAXES - Narrative (Details) - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Income Taxes [Line Items]
Net increase (decrease) in total valuation allowance	$ 100,000	$ (2,100,000)
Unrecognized tax benefits that will impact the company's effective tax rate	2,400,000
Accrued interest or penalties related to uncertain tax positions	0
State
Income Taxes [Line Items]
Net operating losses subject to expiration	25,200,000
State | Research and Development Tax Credit | California
Income Taxes [Line Items]
Tax credit carryforwards	4,400,000
Foreign Tax Authority | Research and Development Tax Credit
Income Taxes [Line Items]
Tax credit carryforwards	800,000
Federal
Income Taxes [Line Items]
Net operating loss carryforwards	0
Federal | Research and Development Tax Credit
Income Taxes [Line Items]
Tax credit carryforwards	$ 0