Leases - Right of use assets and lease liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Assets [Abstract]
Operating leases	$ 966	$ 1,160
Lease receivable - current	8	17
Lease receivable - noncurrent	7	3
Total lease receivable	15	20
Liabilities
Current operating lease liabilities	$ 502	$ 550
Current operating lease liabilities, Statement of Financial Position	Accounts payable and accrued expenses	Accounts payable and accrued expenses
Non-current operating lease liabilities	$ 482	$ 623
Total operating lease liabilities	984	1,173
Current finance lease liabilities	$ 0	$ 4
Current finance lease liabilities, Statement of Financial Position	Accounts payable and accrued expenses	Accounts payable and accrued expenses