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Summary of Significant Accounting Policies - Deferred Profit (Details) $ in Thousands | Mar. 31, 2016 USD ($) systems equipment | Sep. 30, 2015 USD ($)
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Number of similarly configured systems and processes | systems | 2 |
Number of similarly configured items of equipment | equipment | 2 |
Deferred revenues | $ 5,746 | $ 7,280
Deferred costs | 2,315 | 2,407
Deferred profit | $ 3,431 | $ 4,873

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