Earnings Per Share - Reconciliation of Components of Basic and Diluted EPS Calculations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net (loss) income from continuing operations	$ (246)	$ (543)	$ 473	$ (1,810)
Loss from discontinued operations, net of tax		(11,151)		(11,816)
Net (loss) income	$ (246)	$ (11,694)	$ 473	$ (13,626)
Denominator:
Weighted-average shares used to compute basic EPS	14,151	14,150	14,121	14,193
Common stock equivalents			96
Weighted-average shares used to compute diluted EPS	14,151	14,150	14,217	14,193
Basic (loss) income per share from continuing operations	$ (0.02)	$ (0.04)	$ 0.03	$ (0.13)
Basic loss per share from discontinued operations		(0.79)		(0.83)
Net (loss) income per basic share	(0.02)	(0.83)	0.03	(0.96)
Diluted (loss) income per share from continuing operations	(0.02)	(0.04)	0.03	(0.13)
Diluted loss per share from discontinued operations		(0.79)		(0.83)
Net (loss) income per diluted share	$ (0.02)	$ (0.83)	$ 0.03	$ (0.96)