Leases - Other Information Related to Leases (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Weighted-average remaining lease term	8 years 6 months		8 years 6 months
Weighted-average discount rate	6.00%		6.00%
Cash paid for amounts included in the measurement of lease liabilities	$ 815	$ 336	$ 2,483	$ 2,803
New lease liabilities, net of new right-of-use assets	0	0	0	245
Lease liabilities arising from obtaining right-of-use-assets	$ 0	$ 0	$ 0	$ 7,179