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Concentrations of credit risk (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Concentration Risk [Line Items]
Cash, FDIC insured amount	$ 11.6
Revenue from Contract with Customer Benchmark [Member] | Distributor
Concentration Risk [Line Items]
Concentration risk, percentage	19.00%	62.00%
Revenue from Contract with Customer Benchmark [Member] | Wireless Carrier
Concentration Risk [Line Items]
Concentration risk, percentage	23.00%
Accounts Receivable | Distributor
Concentration Risk [Line Items]
Concentration risk, percentage		48.00%
Accounts Receivable | Wireless Carrier
Concentration Risk [Line Items]
Concentration risk, percentage	56.00%

X

- Definition

The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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