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Trade Accounts Receivable and Financing Receivables - Financing Receivables (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Sep. 30, 2019
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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Amount, after allowance for credit loss, of financing receivable, classified as current. Includes, but is not limited to, notes and loan receivable.

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Amount, before allowance for credit loss, of financing receivable.

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