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Financing Receivables (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2015
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Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total financing receivables | $ 12,887 |  |  |  | $ 3,850 | $ 3,520
Total unearned income | (617) |  |  |  |  |
Total financing receivables, net of unearned income | 12,270 |  |  |  | 3,850 | 3,520
Allowance for doubtful notes | (1,020) |  |  |  | (500) | 0
Less current portion | 3,055 | $ 2,614 | $ 1,890 | $ 1,678 | 1,533 | 2,004
Non-current financing receivables | 8,195 | $ 588 | $ 427 | $ 1,385 | 1,817 | 1,516
Promissory Notes |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total financing receivables | 4,306 |  |  |  | $ 3,850 | $ 3,520
Sales Type Lease |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total financing receivables | 8,581 |  |  |  |  |
Total unearned income | (527) |  |  |  |  |
Notes |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total unearned income | $ (90) |  |  |  |  |

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