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Accounts and Financing Receivables - Additional Information (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
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Accounts Notes And Loans Receivable [Line Items] |  |
Trade accounts receivable | $ 25,144 | $ 15,776
Rental Equipment |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Interest rate | 5.00% |
Term of sales-type lease | 3 years |
Future minimum lease payments | $ 2,900 |
Future minimum lease payments of unearned income | 100 |
Single Customer |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Trade accounts receivable | $ 8,500 |

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