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