Statement of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (5,311)	$ (15,881)	$ (42,389)	$ (33,238)
Foreign currency translation adjustments	105	(128)	(28)	(41)
Total comprehensive loss	$ (5,206)	$ (16,009)	$ (42,417)	$ (33,279)