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Accrued product warranty liability (Tables)
3 Months Ended
Mar. 31, 2021
Accrued product warranty liability [Abstract]  
Product warranty liability
The following table summarizes the activity recorded in the accrued product warranty liability during the three months ended March 31, 2021 and 2020:

 
Three Months Ended
 
 
March 31,
 
   
2021
   
2020
 
   
(In thousands)
 
             
Balance, beginning of period
 
$
140
   
$
215
 
Warranties issued
   
5
     
45
 
Warranty settlements
   
(29
)
   
(47
)
Balance, end of period
 
$
116
   
$
213