Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (5,635)	$ 2,835	$ (8,007)	$ 9,287
Foreign currency translation adjustment	(210)	796	(786)	1,337
Comprehensive (loss) income	$ (5,845)	$ 3,631	$ (8,793)	$ 10,624