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Accrued Liabilities (Tables) | 6 Months Ended
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Apr. 30, 2021
Accrued Liabilities Current [Abstract] |
Schedule of Accrued Liabilities | Accrued liabilities as of April 30, 2021 and October 31, 2020 consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | April 30, | ​ | October 31,
​ |  | 2021 |  | 2020
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.

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