Revenue Recognition - Schedule of Impacts of Topic 606 on Consolidated Statements of Operations and Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2020	Jul. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 16,999	$ 18,728	$ 18,880	$ 16,264	$ 11,041	$ 22,712	$ 9,216	$ 17,783	$ 70,871	$ 60,752	$ 89,437
Total cost of revenues									78,596	82,021	86,344
Gross loss	(8,045)	(3,128)	167	3,281	(23,389)	7,965	(3,640)	(2,205)	(7,725)	(21,269)
Administrative and selling expenses									26,644	31,874	24,908
Research and development expenses									4,797	13,786	22,817
Loss from operations	(17,122)	(10,762)	(8,142)	(3,140)	(32,992)	(1,070)	(17,623)	(15,244)	(39,166)	(66,929)	(44,632)
Interest expense									(15,294)	(10,623)	(9,055)
Other income, net									684	93	3,338
Loss before (provision) benefit for income taxes									(89,061)	(77,459)	(50,349)
Provision for income taxes									(46)	(109)	3,015
Net loss	$ (18,856)	$ (15,331)	$ (14,769)	$ (40,151)	$ (35,179)	$ (5,311)	$ (19,530)	$ (17,548)	$ (89,107)	(77,568)	$ (47,334)
Adjustments Due to Topic 606 [Member] | Topic 606 [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues										4,085
Total cost of revenues										1,478
Gross loss										2,607
Loss from operations										2,607
Loss before (provision) benefit for income taxes										2,607
Net loss										2,607
Balances Without Adoption of ASC 606 [Member] | Topic 606 [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues										64,837
Total cost of revenues										83,499
Gross loss										(18,662)
Administrative and selling expenses										31,874
Research and development expenses										13,786
Loss from operations										(64,322)
Interest expense										(10,623)
Other income, net										93
Loss before (provision) benefit for income taxes										(74,852)
Provision for income taxes										(109)
Net loss										$ (74,961)