LEASES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023	Sep. 30, 2023
Leases [Abstract]
Weighted average remaining lease term of operating leases (in years)	4 years 7 months 6 days		4 years 7 months 6 days
Weighted average discount rate of operating leases(as a percent)	3.40%		3.40%
Right-of-use assets	$ 3,313		$ 3,313		$ 4,140
ROU liabilities	3,758		3,758		4,800
Lease liabilities, current portion	1,168		1,168		1,902
Lease liabilities, non-current portion	2,590		2,590		$ 2,867
Operating lease costs	$ 400	$ 500	900	$ 1,100
Operating cash flows for operating leases paid			$ 1,100