Schedule of Accrued Liabilities (Details) - USD ($) $ in Thousands		Apr. 30, 2021	Oct. 31, 2020
Accrued Liabilities Current [Abstract]
Accrued payroll and employee benefits		$ 3,256	$ 4,461
Accrued product warranty cost	[1]	85	97
Accrued service agreement and PPA costs	[2]	7,055	7,037
Accrued legal, taxes, professional and other		3,023	4,086
Accrued liabilities		$ 13,419	$ 15,681

[1] The decrease in accrued product warranty cost represents a reduction related to actual warranty activity as contracts progress through the warranty period. Product warranty expense for the three months ended April 30, 2021 and 2020 was $6 thousand and $0.01 million, respectively, and for the six months ended April 30, 2021 and 2020 was $12 thousand and $0.03 million, respectively.

[2] Accrued service agreement costs include loss accruals on service agreements of $5.5 million as of each of October 31, 2020 and April 30, 2021. The accruals for performance guarantees, including PPA performance guarantees was $1.6 million as of April 30, 2021, which reflects an increase from $1.4 million as of October 31, 2020.