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Accrued Expenses

6 Months Ended

Jun. 30, 2021

Accrued Expenses

9. Accrued Expenses

9. Accrued Expenses

Accrued expenses consisted of the following (in thousands):

		June 30,				December 31,
		2021				2020
Accrued wages, benefits and payroll taxes		$	2,066			$	513
Accrued accounts payable			691				505
Accrued sales and telecommunication taxes			2,576				438
Product warranty liability			30				33
Other accrued expenses			92				139
Total accrued expenses		$	5,455			$	1,628

The changes in aggregate product warranty liabilities for the year ended December 31, 2020 and six months ended June 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			12
Warranty settlements			(15	)
Balance at June 30, 2021		$	30

Product warranty expense is included in cost of product revenue expense and totaled $8,000 and $10,000 for the three months ended June 30, 2021 and 2020, respectively, and $15,000 and $18,000 for the six months ended June 30, 2021 and 2020, respectively.

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