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Accrued product warranty liability (Tables)
 6 Months Ended
Jun. 30, 2022
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, 2022 and 2021:

 
Six Months Ended
  
 
June 30,
  
   
2022
    
2021
  
   
(In thousands)
  
             
Balance, beginning of period
  
$
101
    
$
140
  
Warranties issued
    
12
      
19
  
Warranty settlements
    
(33
)
    
(45
)
Balance, end of period
  
$
80
    
$
114