Leases - Other Information Related to Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Weighted-average remaining lease term	8 years 8 months 12 days		8 years 8 months 12 days
Weighted-average discount rate	5.99%		5.99%
Cash paid for amounts included in the measurement of lease liabilities	$ 786	$ 1,197	$ 1,667	$ 2,467
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