Revenue Recognition - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018	Jun. 11, 2019	Oct. 31, 2018
Disaggregation Of Revenue [Line Items]
Revenues	$ 22,712	$ 12,110	$ 49,711	$ 71,553
Contract asset	12,300		12,300			$ 23,200
Transferred to accounts receivable			6,600
Contract liability	37,800		37,800			$ 28,100
Remaining performance obligations	284,100		284,100
Topic 606 [Member]
Disaggregation Of Revenue [Line Items]
Adjustment to net loss			1,900
EMRE [Member]
Disaggregation Of Revenue [Line Items]
License agreement payment					$ 10,000
Revenues	$ 10,000		$ 10,000