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Other Accrued Liabilities (Tables)
 6 Months Ended
Jun. 30, 2020
Other Accrued Liabilities [Abstract]  
Other Accrued Liabilities
Other accrued liabilities consist of:

  
June 30, 2020
  
December 31, 2019
 
       
Accrued warranty, current
 
$
119
  
$
170
 
Accrued compensation, including commissions and vacation
  
1,000
   
1,193
 
Accrued state sales, use and other taxes
  
3,097
   
3,193
 
Accrued professional fees and other accrued liabilities
  
487
   
578
 
Total other accrued liabilities
 
$
4,703
  
$
5,134
 
Accrued Warranty Costs Activity
The activity in the warranty accrual during the three and six months ended June 30, 2020 and, 2019, is summarized as follows:
 
  
Three Months Ended,
June 30,
  
Six Months Ended,
June 30,
 
  
2020
  
2019
  
2020
  
2019
 
Accrual at beginning of period
 
$
181
  
$
272
  
$
232
  
$
238
 
Additions charged to warranty expense
  
6
   
75
   
9
   
143
 
Expiring warranties/claimed satisfied
  
(48
)
  
(56
)
  
(102
)
  
(90
)
Total
  
139
   
291
   
139
   
291
 
Less: current portion
  
(119
)
  
(194
)
  
(119
)
  
(194
)
Total long-term accrued warranty costs
 
$
20
  
$
97
  
$
20
  
$
97