Summary of Significant Accounting Policies - Net Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net loss	$ (6,202)	$ (1,050)	$ (10,467)	$ (3,947)
Weighted-average common shares outstanding (basic) (in shares)	5,499,000	5,466,000	5,480,000	5,460,000
Effect of dilutive securities:
Weighted-average common shares outstanding (diluted) (in shares)	5,499,000	5,466,000	5,480,000	5,460,000
Net loss per share - basic (in dollars per share)	$ (1.13)	$ (0.19)	$ (1.91)	$ (0.72)
Net loss per share - diluted (in dollars per share)	$ (1.13)	$ (0.19)	$ (1.91)	$ (0.72)
Anti-dilutive weighted-average common shares excluded from calculation of diluted earnings per share (in shares)	98,000	38,000	93,000	23,000
Restricted Stock
Effect of dilutive securities:
Restricted shares (in shares)	0	0	0	0
Anti-dilutive weighted-average common shares excluded from calculation of diluted earnings per share (in shares)	0	0	0	0