LEASES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Sep. 30, 2024
Leases [Abstract]
Weighted average remaining lease term of operating leases (in years)	4 years 6 months		4 years 6 months
Weighted average discount rate of operating leases (as a percent)	7.90%		7.90%
Right-of-use assets	$ 2,331		$ 2,331		$ 4,662
ROU liabilities	2,723		2,723		5,000
Lease liabilities, current portion	660		660		805
Lease liabilities, non-current portion	2,063		2,063		$ 4,230
Operating lease costs	$ 200	$ 600	600	$ 1,500
Operating cash flows for operating leases paid			$ 600