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Related party transactions - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Jun. 15, 2011	Oct. 31, 2017	Oct. 31, 2016
New York [Member]
Related Party Transaction [Line Items]
Operating Leases, Rent Expense	$ 13,000
Payments for Rent		$ 156,000
Chief Executive Officer [Member]
Related Party Transaction [Line Items]
Due from Officers or Stockholders, Noncurrent			$ 67,000
Debt Instrument, Interest Rate During Period			6.00%