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Trade Accounts Receivable and Financing Receivables - Financing Receivables (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Sep. 30, 2019
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Accounts Notes And Loans Receivable [Line Items] |  |
Total financing receivables | $ 1,704 | $ 3,472
Total unearned income | (18) | (55)
Total financing receivables, net of unearned income | 1,686 | 3,417
Less current portion | (1,639) | (3,233)
Non-current financing receivables | 47 | 184
Promissory Notes |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Total financing receivables | 432 | 780
Sales Type Lease |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Total financing receivables | 1,272 | 2,692
Total unearned income | $ (18) | $ (55)

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