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Summary of Significant Accounting Policies (Revenue Recognition) (Details) $ in Thousands | Sep. 30, 2018 USD ($) | Sep. 30, 2017 systems | Sep. 30, 2017 USD ($) | Sep. 30, 2017 equipment
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |
Number of similarly configured systems and processes |  | 2 |  | 2
Number of similarly configured items of equipment | equipment |  |  |  | 2
Deferred revenue | $ 5,616 |  | $ 6,822 |
Deferred costs | 2,545 |  | 2,741 |
Deferred profit | $ 3,071 |  | $ 4,081 |

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