Financing Receivables (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Accounts Notes And Loans Receivable [Line Items]
Total financing receivables	$ 13,172	$ 12,887
Total unearned income	(465)	(617)
Total financing receivables, net of unearned income	12,707	12,270
Less allowance for doubtful promissory notes	(1,505)	(1,020)
Less current portion	(5,036)	(3,055)
Non-current financing receivables	6,166	8,195
Promissory Notes
Accounts Notes And Loans Receivable [Line Items]
Total financing receivables	6,236	4,306
Total unearned income	(95)	(90)
Sales Type Lease
Accounts Notes And Loans Receivable [Line Items]
Total financing receivables	6,936	8,581
Total unearned income	$ (370)	$ (527)