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Schedule of Accrued Liabilities (Parenthetical) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2021
Jul. 31, 2020
Oct. 31, 2020
Schedule Of Accrued Liabilities [Line Items]          
Product warranty accrual, payment and adjustments $ 7 $ 10 $ 19 $ 40  
Loss reserve on service agreements 5,300   5,300   $ 5,500
Bridgeport Fuel Cell Project [Member]          
Schedule Of Accrued Liabilities [Line Items]          
Reserve for performance guarantees $ 2,000   $ 2,000   $ 1,400