Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator [Abstract]
Net income	$ 1,614	$ 945	$ 79	$ 2,248
Denominator [Abstract]
Denominator for basic net income (loss) per share - weighted-average outstanding shares (shares)	11,899	11,299	11,875	11,250
Effect of dilutive securities:
Stock options and restricted stock (shares)	985	1,146	997	1,167
Denominator for diluted net income (loss) per share - weighted-average outstanding shares (shares)	12,884	12,445	12,872	12,417
Net income per share, basic (in dollars per share)	$ 0.14	$ 0.08	$ 0.01	$ 0.20
Net income per share - diluted (in dollars per share)	$ 0.13	$ 0.08	$ 0.01	$ 0.18