Equity (Schedule of Earnings per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Numerator:
(Loss) income from continuing operations	$ (3,071)	$ 1,855	$ (3,153)	$ 3,621
Loss from discontinued operations	0	(7)	0	(16)
Undistributed earnings allocated to common shareholders for basic and diluted net income per share	$ (3,071)	$ 1,848	$ (3,153)	$ 3,605
Denominator:
Denominator for basic net income per share - weighted average shares outstanding (in shares)	27,197	26,622	27,113	26,449
Dilutive options outstanding, unvested stock units and ESPP (in shares)	0	963	0	917
Denominator for diluted net income per share - adjusted weighted average shares outstanding (in shares)	27,197	27,585	27,113	27,366
Net (loss) income per basic share:
Continuing operations (in usd per share)	$ (0.11)	$ 0.07	$ (0.12)	$ 0.14
Discontinued operations (in usd per share)	0.00	0.00	0.00	0.00
Net income per basic share (in usd per share)	(0.11)	0.07	(0.12)	0.14
Net (loss) income per diluted share:
Continuing operations (in usd per share)	(0.11)	0.07	(0.12)	0.13
Discontinued operations (in usd per share)	0.00	0.00	0.00	0.00
Net income per diluted share (in usd per share)	$ (0.11)	$ 0.07	$ (0.12)	$ 0.13
Weighted average antidilutive options, unvested restricted stock units and awards, warrants and ESPP shares excluded from the computation (in shares)	972	370	793	550
Average market price of common stock (in dollars per share)	$ 6.05	$ 9.11	$ 6.79	$ 7.99