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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Net (loss) income	$ (357)	$ 1,331	$ (4,926)	$ 3,688
Denominator:
Denominator for basic net (loss) income per common share — weighted average shares outstanding	27,084,000	26,477,000	26,914,000	26,324,000
Effect of dilutive securities:
Stock options and restricted stock units	0	775,000	0	810,000
Denominator for diluted net (loss) income per common share — adjusted weighted average shares	27,084,000	27,252,000	26,914,000	27,134,000
Basic net (loss) income per common share:
Net (loss) income, basic (USD per share)	$ (0.01)	$ 0.05	$ (0.18)	$ 0.14
Diluted net (loss) income per common share
Net (loss) income, diluted (USD per share)	$ (0.01)	$ 0.05	$ (0.18)	$ 0.14
Potentially dilutive securities excluded from computation of earnings per share	1,458,297	730,400	1,988,673	1,077,150
Excluded incremental common shares related to common stock options and restricted stock units	275,522		333,801

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