Summary of Significant Accounting Policies - Deferred Profit (Details) $ in Thousands	Jun. 30, 2017 USD ($) systems equipment	Sep. 30, 2016 USD ($)
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	$ 10,024	$ 7,029
Deferred costs	4,575	2,320
Deferred profit	$ 5,449	$ 4,709