Commitments and Contingencies (Tables)

12 Months Ended

Sep. 30, 2021

Commitments and Contingencies Disclosure [Abstract]

Schedule of Maturities of Operating Lease Liabilities

Maturities of operating lease liabilities as of September 30, 2021 were as follows:

(in thousands)	Amount
2022	$	1,955
2023	1,856
2024	1,686
2025	1,730
2026	1,775
Thereafter	10,592
Total lease payments	$	19,594
Less imputed interest	(5,712)
Total	$	13,882

Schedule of Operating Lease Information

Weighted-average remaining lease term and discount rate related to operating leases are as follows:

	As of September 30,
	2021		2020
Weighted average remaining lease term (years)	11.9		14.4
Weighted average discount rate	6.1	%	6.1	%

Supplemental cash information and non-cash activities related to operating leases are as follows:

	As of September 30,
(in thousands)	2021		2020
Operating cash outflows from operating leases	$	1,975	$	1,592
Right-of-use assets obtained in exchange for operating lease liabilities	$	10,358	$	10,791

Schedule of Change in Asset Retirement Obligation

The following table summarizes ARO activity:

(in thousands)	Amount
Balance at September 30, 2020	$	2,022
Accretion expense	48
Revision in estimated cash flows	(21)
Balance at September 30, 2021	$	2,049