Income Taxes (Components of income before income tax) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Results of Operations by Geographical Areas [Line Items]
Income (loss) before provision for income taxes	$ 9,830	$ (5,450)	$ (4,807)
Domestic
Results of Operations by Geographical Areas [Line Items]
Income (loss) before provision for income taxes	1,900	2,100	94
Foreign
Results of Operations by Geographical Areas [Line Items]
Income (loss) before provision for income taxes	$ 7,930	$ (7,550)	$ (4,901)