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Accrued product warranty liability (Tables)
6 Months Ended
Jun. 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 six months ended June 30, 2021 and 2020:

 
Six Months Ended
 
 
June 30,
 
   
2021
   
2020
 
   
(In thousands)
 
             
Balance, beginning of period
 
$
140
   
$
215
 
Warranties issued
   
19
     
55
 
Warranty settlements
   
(45
)
   
(78
)
Balance, end of period
 
$
114
   
$
192