Leases - Other Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Right Of Use Asset Obtained In Exchange for Lease Liability [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities		$ 1,784	$ 1,175
Cash paid for leases [Abstract]
Right-of-use assets obtained in exchange for new operating lease liability		3,238	593
Non-cash Tenant Improvement Allowance [Abstract]
Tenant improvement allowance	$ 0	$ 1,000	$ 0
Weighted average remaining lease term [Abstract]
Weighted average remaining lease term- operating leases		6 years 4 months 24 days
Weighted Average Discount Rate Leases [Abstract]
Weighted average discount rate - operating leases		4.50%