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Financing Receivables (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Sep. 30, 2018
Accounts Notes And Loans Receivable [Line Items]    
Total financing receivables $ 8,762 $ 11,179
Total unearned income (245) (332)
Total financing receivables, net of unearned income 8,517 10,847
Allowance for doubtful promissory notes (2,104) (1,849)
Less current portion (3,660) (4,258)
Non-current financing receivables 2,753 4,740
Promissory Notes    
Accounts Notes And Loans Receivable [Line Items]    
Total financing receivables 4,730 5,646
Total unearned income (95) (95)
Sales Type Lease    
Accounts Notes And Loans Receivable [Line Items]    
Total financing receivables 4,032 5,533
Total unearned income $ (150) $ (237)