Financing Receivables (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Accounts Notes And Loans Receivable [Line Items]
Total financing receivables	$ 3,472	$ 11,179
Total unearned income	(55)	(332)
Total financing receivables, net of unearned income	3,417	10,847
Allowance for doubtful promissory notes	0	(1,849)
Less current portion	(3,233)	(4,258)
Non-current financing receivables	184	4,740
Promissory Notes
Accounts Notes And Loans Receivable [Line Items]
Total financing receivables	780	5,646
Total unearned income		(95)
Sales Type Lease
Accounts Notes And Loans Receivable [Line Items]
Total financing receivables	2,692	5,533
Total unearned income	$ (55)	$ (237)