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Accrued Expenses | 9 Months Ended
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Sep. 30, 2021
Accrued Expenses |
9. Accrued Expenses | 9. Accrued Expenses Accrued expenses consisted of the following (in thousands):
|  | September 30, |  |  | December 31, |
|  | 2021 |  |  | 2020 |
Accrued wages, benefits and payroll taxes |  | $ | 698 |  |  | $ | 513 |
Accrued accounts payable |  |  | 915 |  |  |  | 505 |
Accrued sales and telecommunication taxes |  |  | 2,616 |  |  |  | 438 |
Product warranty liability |  |  | 34 |  |  |  | 33 |
Other accrued expenses |  |  | 88 |  |  |  | 139 |
Total accrued expenses |  | $ | 4,351 |  |  | $ | 1,628 |
The changes in aggregate product warranty liabilities for the year ended December 31, 2020 and nine months ended September 30, 2021 were as follows (in thousands):
|  | Warranty Liabilities |
Balance at January 1, 2020 |  | $ | 37 |
Accrual for warranties |  |  | 33 |
Adjustments related to pre-existing warranties |  |  | (10 | )
Warranty settlements |  |  | (27 | )
Balance at December 31, 2020 |  |  | 33 |
Accrual for warranties |  |  | 27 |
Warranty settlements |  |  | (26 | )
Balance at September 30, 2021 |  | $ | 34 |
Product warranty expense is included in cost of product revenue expense and totaled $15,000 and $11,000 for the three months ended September 30, 2021 and 2020, respectively, and $27,000and $29,000for the nine months ended September 30, 2021 and 2020, respectively.

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