Accounts and Financing Receivables - Financing Receivables (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Accounts Notes And Loans Receivable [Line Items]
Total financing receivables	$ 184	$ 3,472
Total unearned income		(55)
Total financing receivables, net of unearned income	184	3,417
Less current portion	(184)	(3,233)
Non-current financing receivables		184
Promissory Notes
Accounts Notes And Loans Receivable [Line Items]
Total financing receivables	$ 184	780
Sales Type Lease
Accounts Notes And Loans Receivable [Line Items]
Total financing receivables		2,692
Total unearned income		$ (55)