Summary of Significant Accounting Policies - Net Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net loss	$ (911)	$ (2,609)
Weighted-average common shares outstanding (basic and diluted) (in shares)	5,502,000	5,467,000
Net loss per share - basic and diluted (in dollars per share)	$ (0.17)	$ (0.48)
Anti-dilutive weighted-average common shares excluded from calculation of diluted earnings per share (in shares)	110,000	59,000
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