Cash and Cash Equivalents, Customer Concentrations, and Allowances for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Cash and Cash Equivalents, Customer Concentrations, and Allowances for Credit Losses
Beginning balance	$ 71	$ 125	$ 76	$ 144
Provisions for credit losses	5	8	0	12
Accounts receivable write-offs	0	0	0	(23)
Ending balance	$ 76	$ 133	$ 76	$ 133