Segment Information - Major customers (Details) - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Customer Revenues	$ 64,647,000	$ 54,361,000
Customer A | Sales Revenue, Net | Customer Concentration Risk
Segment Reporting Information [Line Items]
Customer Revenues	$ 2,800,000	$ 10,400,000
Concentration risk percentage	4.00%	19.00%
Customer A | Accounts Receivable | Customer Concentration Risk
Segment Reporting Information [Line Items]
Accounts receivable, gross	$ 7,400,000	$ 15,800,000
Concentration risk percentage	30.00%	52.00%