8. Accrued Expenses

6 Months Ended

Jun. 30, 2019

Payables and Accruals [Abstract]

Accrued Expenses

Accrued expenses consisted of the following (in thousands):

	June 30, 2019		December 31, 2018
Accrued wages and benefits	$	297	$	301
Accrued accounts payable		326		243
Accrued sales and telecommunication taxes		505		480
Product warranty liability		15		16
Other		73		91
Total accrued expenses	$	1,216	$	1,131

The changes in aggregate product warranty liabilities for the year ended December 31, 2018 and six months ended June 30, 2019 were as follows (in thousands):

	Warranty Liabilities
Balance at January 1, 2018	$	-
Accrual for warranties		31
Warranty settlements		(15	)
Balance at December 31, 2018		16
Accrual for warranties		10
Warranty settlements		(11	)
Balance at June 30, 2019	$	15

Product warranty expense is included in cost of product revenue expense and totaled $5,000 and $5,000 for the three months ended June 30, 2019 and 2018, respectively, and $10,000 and $9,000 for the six months ended June 30, 2019 and 2018, respectively.