Statement of Comprehensive Loss Statement - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (89,107)	$ (77,568)	$ (47,334)
Foreign currency translation adjustments	(92)	(244)	12
Total comprehensive loss	$ (89,199)	$ (77,812)	$ (47,322)