Commitments and Contingencies - Additional Lease Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Commitments and Contingencies Disclosure [Abstract]
Weighted average remaining lease term (years)	10 years	9 years 9 months 18 days
Weighted average discount rate	9.50%	5.40%
Operating cash outflows from operating leases	$ 3,749	$ 2,011
Right-of-use assets obtained in exchange for operating lease liabilities	$ 2,577	$ 1,529