Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (4,569)	$ 2,357
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	271	(3,755)
Change in net unrealized loss on investments	(21)	(24)
Less income tax benefit	3	9
Other comprehensive income (loss), net of tax	253	(3,770)
Comprehensive loss	$ (4,316)	$ (1,413)