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Trade Accounts Receivable and Financing Receivables - Additional Information (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
May 26, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2018 | Sep. 30, 2019
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |
Accounts receivable |  | $ 14,874,000 |  |  | $ 14,874,000 |  |  |  | $ 25,144,000
Value of notes with customer |  | $ 939,000 |  |  | $ 939,000 |  |  |  | 3,472,000
Promissory notes receivable maturity month and year |  |  |  |  | 2023-01 |  |  |  |
Term of sales-type lease |  | 3 years |  |  | 3 years |  |  |  |
Future minimum lease payments |  | $ 700,000 |  |  | $ 700,000 |  |  |  |
Future minimum lease payments of unearned income |  | 5,000 |  |  | 5,000 |  |  |  |
Interest income earned on lease |  | $ 10,000 |  | $ 100,000 | $ 38,000 | $ 100,000 |  |  |
Manufactured Rental Equipment |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |
Promissory notes receivable maximum interest rate |  | 7.00% |  |  | 7.00% |  |  |  |
Product |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |
Partially financed product sale |  |  | $ 12,500,000 |  |  |  |  |  |
Secured Promissory Note |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate of the notes |  |  | 7.00% |  |  |  |  |  |
Frequency of payments |  |  | monthly |  | monthly |  |  |  |
Value of notes with customer |  |  | $ 10,000,000.0 |  |  |  |  |  |
Term of the notes |  |  | 3 years |  |  |  |  |  |
Monthly principal and interest payments |  |  | $ 300,000 |  |  |  |  |  |
Marketable Debt Securities |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |
Transition of unpaid invoices and late fee into debt securities | $ 13,000 |  |  |  |  |  |  |  |
Term of debt securities | 24 months |  |  |  |  |  |  |  |
Interest rate of the notes | 8.00% |  |  |  |  |  |  |  |
Frequency of payments |  |  |  |  | bi-annual interest and principal payments |  |  |  |
Premium interest rate for paid in kind payments |  |  |  |  | 10.00% |  |  |  |
Maturity date of debt securities |  |  |  |  | Jul. 14, 2022 |  |  |  |
Scenario Forecast |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |
Reversal of operating lease receivable and rental revenue |  |  |  |  |  |  | $ 8,000,000.0 |  |
Single Customer |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |
Accounts receivable |  | $ 14,000,000.0 |  |  | $ 14,000,000.0 |  |  |  |
Unrecognized rental revenue and late payment penalties |  |  |  |  | 5,700,000 |  |  |  |
Proceeds from contract customers |  |  |  |  | 6,200,000 |  |  |  |
Revenue recognized |  | 3,600,000 |  |  |  |  |  |  |
Received cash payment in excess |  |  |  |  |  |  |  | $ 24,000,000 |
Single Customer | Trade Accounts Receivable |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |
Accounts receivable |  | $ 8,300,000 |  |  | $ 8,300,000 |  |  |  | $ 8,500,000

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