Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (11,694)	$ (5,635)	$ (13,626)	$ (8,007)
Foreign currency translation adjustment	(459)	(210)	622	(786)
Reclassification adjustment for net foreign currency translation losses included in net loss	7,205		8,797
Comprehensive loss	$ (4,948)	$ (5,845)	$ (4,207)	$ (8,793)