Equity (Schedule of Earnings per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Numerator:
(Loss) income from continuing operations	$ (5,886)	$ (8,414)	$ (3,071)	$ (82)	$ 2,164	$ 2,436	$ 1,855	$ 1,766	$ (17,453)	$ 8,221	$ 2,619
Loss from discontinued operations	0	0	0	0	41	(11)	(7)	(9)	0	14	5,647
Undistributed earnings allocated to common shareholders for basic and diluted net income per share	$ (5,886)	$ (8,414)	$ (3,071)	$ (82)	$ 2,205	$ 2,425	$ 1,848	$ 1,757	$ (17,453)	$ 8,235	$ 8,266
Denominator:
Denominator for basic net income per share - weighted average shares outstanding (in shares)					26,904	26,833	26,622	26,279	27,266	26,659	25,979
Dilutive options outstanding, unvested stock units and ESPP (in shares)									0	885	539
Denominator for diluted net income per share - adjusted weighted average shares outstanding (in shares)					27,768	27,816	27,585	27,039	27,266	27,544	26,518
Net (loss) income per basic share:
Continuing operations (in usd per share)	$ (0.21)	$ (0.31)	$ (0.11)	$ 0.00	$ 0.08	$ 0.09	$ 0.07	$ 0.07	$ (0.64)	$ 0.31	$ 0.10
Discontinued operations (in usd per share)									0.00	0.00	0.22
Net income per basic share (in usd per share)									(0.64)	0.31	0.32
Net (loss) income per diluted share:
Continuing operations (in usd per share)	(0.21)	(0.31)	(0.11)	0.00	0.08	0.09	0.07	0.07	(0.64)	0.30	0.10
Discontinued operations (in usd per share)									0.00	0.00	0.21
Net income per diluted share (in usd per share)	$ (0.21)	$ (0.31)	$ (0.11)	$ 0.00	$ 0.08	$ 0.09	$ 0.07	$ 0.07	$ (0.64)	$ 0.30	$ 0.31
Weighted average antidilutive options, unvested restricted stock units and awards, warrants and ESPP shares excluded from the computation (in shares)									949	398	508
Average market price of common stock (in dollars per share)									$ 5.87	$ 8.92	$ 5.88