Summary of Significant Accounting Policies - Net Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net loss	$ (1,532)	$ (6,202)	$ (4,481)	$ (10,467)
Weighted-average common shares outstanding (basic and diluted) (in shares)	5,535,000	5,499,000	5,524,000	5,480,000
Net loss per share - basic and diluted (in dollars per share)	$ (0.28)	$ (1.13)	$ (0.81)	$ (1.91)
Anti-dilutive weighted-average common shares excluded from calculation of diluted earnings per share (in shares)	156,000	98,000	135,000	93,000
Restricted Stock
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Anti-dilutive weighted-average common shares excluded from calculation of diluted earnings per share (in shares)	0	0	0	0

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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