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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

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