Concentrations of credit risk (Details) - USD ($) $ in Millions			3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Concentration Risk [Line Items]
Cash, FDIC insured amount	$ 13.1		$ 13.1
Revenue from Contract with Customer Benchmark [Member] | Two distributors
Concentration Risk [Line Items]
Concentration risk, percentage			11.00%
Revenue from Contract with Customer Benchmark [Member] | Wireless Carrier
Concentration Risk [Line Items]
Concentration risk, percentage			17.00%	14.00%
Revenue from Contract with Customer Benchmark [Member] | Distributor
Concentration Risk [Line Items]
Concentration risk, percentage				38.00%
Accounts Receivable | Two distributors
Concentration Risk [Line Items]
Concentration risk, percentage	12.00%
Accounts Receivable | Customer One
Concentration Risk [Line Items]
Concentration risk, percentage		30.00%
Accounts Receivable | Customer two
Concentration Risk [Line Items]
Concentration risk, percentage		22.00%