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Leases - Supplemental cash flow information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 740	$ 757
Operating cash flows from short-term leases	47	38
Operating cash flows from finance leases	11	30
Financing cash flows from finance leases	274	333
Operating leases		216
Cash received from subleases	$ 356	$ 451

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Amount of interest paid on finance lease liability.

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Amount of cash outflow for principal payment on finance lease.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Amount of cash outflow for short-term lease payment excluded from lease liability.

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