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Accrued product warranty liability (Tables)
9 Months Ended
Sep. 30, 2021
Accrued product warranty liability [Abstract]  
Product Warranty Liability
The following table summarizes the activity recorded in the accrued product warranty liability during the nine months ended September 30, 2021 and 2020:

 
Nine Months Ended
 
 
September 30,
 
   
2021
   
2020
 
   
(In thousands)
 
             
Balance, beginning of period
 
$
140
   
$
215
 
Warranties issued
   
39
     
53
 
Warranty settlements
   
(70
)
   
(107
)
Balance, end of period
 
$
109
   
$
161