Earnings Per Share - Reconciliation of Denominators of Basic and Diluted EPS Calculations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net (loss) income from continuing operations	$ (72)	$ 893	$ (1,882)	$ 2,153
Net income (loss) from discontinued operations		1,154	(11,816)	(8,113)
Net (loss) income	$ (72)	$ 2,047	$ (13,698)	$ (5,960)
Denominator:
Weighted-average shares used to compute basic EPS	14,155	14,245	14,195	14,231
Common stock equivalents		71		36
Weighted-average shares used to compute diluted EPS	14,155	14,316	14,195	14,267
Basic (loss) income per share from continuing operations	$ (0.01)	$ 0.06	$ (0.13)	$ 0.15
Basic income (loss) per share from discontinued operations		0.08	(0.83)	(0.57)
Net (loss) income per basic share	(0.01)	0.14	(0.96)	(0.42)
Diluted (loss) income per share from continuing operations	(0.01)	0.06	(0.13)	0.15
Diluted income (loss) per share from discontinued operations		0.08	(0.83)	(0.57)
Net (loss) income per diluted share	$ (0.01)	$ 0.14	$ (0.96)	$ (0.42)