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Financing Receivables (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Accounts Notes And Loans Receivable [Line Items]    
Total financing receivables $ 11,179 $ 12,887
Total unearned income (332) (617)
Total financing receivables, net of unearned income 10,847 12,270
Allowance for doubtful notes (1,849) (1,020)
Less current portion (4,258) (3,055)
Non-current financing receivables 4,740 8,195
Promissory Notes    
Accounts Notes And Loans Receivable [Line Items]    
Total financing receivables 5,646 4,306
Total unearned income (95) (90)
Sales Type Lease    
Accounts Notes And Loans Receivable [Line Items]    
Total financing receivables 5,533 8,581
Total unearned income $ (237) $ (527)