Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2013	Sep. 30, 2016	Sep. 30, 2015
Numerator:
Net income	$ 2,387	$ 776	$ 337	$ (116)	$ 8,238	$ 437	$ (82)	$ 134	$ 3,384	$ 8,728
Denominator:
Denominator for basic net income per share - weighted-average outstanding shares									9,966	9,573
Effect of dilutive securities:
Stock options and restricted stock									1,254	466
Denominator for diluted net income per share - weighted-average outstanding shares									11,220	10,039
Net income (loss) per share - basic (dollars per share)	$ 0.23	$ 0.08	$ 0.03	$ (0.01)	$ 0.86	$ 0.05	$ (0.01)	$ 0.01	$ 0.34	$ 0.91
Net income (loss) per share - diluted (dollars per share)	$ 0.20	$ 0.07	$ 0.03	$ (0.01)	$ 0.82	$ 0.04	$ (0.01)	$ 0.01	$ 0.30	$ 0.87
Income tax expense (benefit), net	$ 1,604	$ (518)	$ (225)	$ 77	$ 5,814	$ (292)	$ 54	$ (89)	$ 938	$ 5,488