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Accrued product warranty liability
 9 Months Ended
Sep. 30, 2022
Accrued product warranty liability [Abstract]  
Accrued product warranty liability
4. Accrued product warranty liability

We generally provide hardware warranties on our products for up to 24 months and record the estimated cost of such product warranties at the time the sale is recorded.  Estimated warranty costs are based upon actual past experience of product repairs and the related estimated cost of labor and material to make the necessary repairs.

The following table summarizes the activity recorded in the accrued product warranty liability during the nine months ended September 30, 2022 and 2021:

 
Nine Months Ended
  
 
September 30,
  
   
2022
    
2021
  
   
(In thousands)
  
             
Balance, beginning of period
  
$
101
    
$
140
  
Warranties issued
    
40
      
39
  
Warranty settlements
    
(64
)
    
(70
)
Balance, end of period
  
$
77
    
$
109
  

As of September 30, 2022, $57 thousand of the accrued product warranty liability was classified as current in “Accrued liabilities” in the Condensed Consolidated Balance Sheet and the remaining $20 thousand was classified as non-current in “Other liabilities”.