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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Schedule Of Earnings Per Share Basic And Diluted [Line Items] |  |  |  |
Performance obligation, description of timing |  |  | one year or less |
Net loss | $ (7,370) | $ (1,532) | $ (9,911) | $ (4,481)
Weighted-average common shares outstanding (basic and diluted) (in shares) | 5,571,000 | 5,535,000 | 5,556,000 | 5,524,000
Net loss per share - basic and diluted (in dollars per share) | $ (1.32) | $ (0.28) | $ (1.78) | $ (0.81)
Anti-dilutive weighted-average common shares excluded from calculation of diluted earnings per share (in shares) | 202,000 | 156,000 | 200,000 | 135,000
Accounting Standards Update 2014-09 | Effect of Accounting Change |  |  |  |
Schedule Of Earnings Per Share Basic And Diluted [Line Items] |  |  |  |
Net loss | $ (487) |  | $ 86 |
LIFO expense | 508 |  | 508 |
Valuation reserves | $ 366 |  | $ 366 |
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 |

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