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9. Accrued Expenses | 6 Months Ended
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Jun. 30, 2020
Payables and Accruals [Abstract] |
Accrued Expenses | Accrued expenses consisted of the following (in thousands):
|  | June 30, 2020 |  |  | December 31, 2019 |
Accrued wages and benefits |  | $ | 416 |  |  | $ | 538 |
Accrued accounts payable |  |  | 398 |  |  |  | 566 |
Accrued sales and telecommunication taxes |  |  | 449 |  |  |  | 529 |
Product warranty liability |  |  | 43 |  |  |  | 37 |
Other |  |  | 81 |  |  |  | 84 |
Total accrued expenses |  | $ | 1,387 |  |  | $ | 1,754 |
The changes in aggregate product warranty liabilities for the year ended December 31, 2019 and six months ended June 30, 2020 were as follows (in thousands):
|  | Warranty Liabilities |
Balance at January 1, 2019 |  | $ | 16 |
Accrual for warranties |  |  | 37 |
Adjustments related to pre-existing warranties |  |  | 7 |
Warranty settlements |  |  | (23 | )
Balance at December 31, 2019 |  |  | 37 |
Accrual for warranties |  |  | 18 |
Warranty settlements |  |  | (12 | )
Balance at June 30, 2020 |  | $ | 43 |
Product warranty expense is included in cost of product revenue expense and totaled $10,000 and $5,000 for the three months ended June 30, 2020 and 2019, respectively, and $18,000 and $10,000 for the six months ended June 30, 2020 and 2019, respectively.

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