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		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net (loss) income from continuing operations	$ (543)	$ 1,012	$ (1,810)	$ 1,260
Net loss from discontinued operations	(11,151)	(6,647)	(11,816)	(9,267)
Net loss	$ (11,694)	$ (5,635)	$ (13,626)	$ (8,007)
Denominator:
Weighted-average shares used to compute basic EPS	14,150	14,228	14,193	14,224
Common stock equivalents		30		31
Weighted-average shares used to compute diluted EPS	14,150	14,258	14,193	14,255
Basic (loss) income per share from continuing operations	$ (0.04)	$ 0.07	$ (0.13)	$ 0.09
Basic loss per share from discontinued operations	(0.79)	(0.47)	(0.83)	(0.65)
Net loss per basic share	(0.83)	(0.40)	(0.96)	(0.56)
Diluted (loss) income per share from continuing operations	(0.04)	0.07	(0.13)	0.09
Diluted loss per share from discontinued operations	(0.79)	(0.47)	(0.83)	(0.65)
Net loss per diluted share	$ (0.83)	$ (0.40)	$ (0.96)	$ (0.56)