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Trade Accounts Receivable and Financing Receivables - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2019
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Accounts receivable | $ 25,669,000 |  |  | $ 25,669,000 |  |  | $ 25,144,000
Revenue | 9,517,000 |  | $ 11,845,000 | $ 18,600,000 | $ 22,304,000 |  |
Bad debt expenses | $ 8,000,000 |  |  |  |  |  |
Promissory notes receivable maximum interest rate | 7.00% |  |  | 7.00% |  |  |
Promissory notes receivable maturity month and year |  |  |  | 2023-01 |  |  |
Term of sales-type lease | 3 years |  |  | 3 years |  |  |
Future minimum lease payments | $ 1,400,000 |  |  | $ 1,400,000 |  |  |
Future minimum lease payments of unearned income | 18,000,000,000 |  |  | 18,000,000,000 |  |  |
Interest income earned on lease | 23,000 |  | $ 100,000 | 100,000 | $ 100,000 |  |
Value of notes with customer | 1,704,000 |  |  | 1,704,000 |  |  | 3,472,000
Secured Promissory Note |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Value of notes with customer | $ 10,000,000 |  |  | $ 10,000,000 |  |  |
Term of the notes | 3 years |  |  |  |  |  |
Interest rate of the notes | 7.00% |  |  | 7.00% |  |  |
Monthly principal and interest payments | $ 300,000 |  |  |  |  |  |
Frequency of payments | monthly |  |  |  |  |  |
Product |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Revenue | $ 0 |  |  |  |  |  |
Partially financed product sale | 12,500,000 |  |  |  |  |  |
Single Customer |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Accounts receivable | 14,000,000 |  |  | $ 14,000,000 |  |  |
Unrecognized rental revenue and late payment penalties |  |  |  | 6,000,000 |  |  |
Revenue |  | $ 2,500,000 |  |  |  |  |
Received cash payment in excess |  |  |  |  |  | $ 20,000,000 |
Single Customer | Trade Accounts Receivable |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Accounts receivable | $ 8,000,000 |  |  | $ 8,000,000 |  |  | $ 8,500,000

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