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Accrued product warranty liability (Tables)
 6 Months Ended
Jun. 30, 2020
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, 2020 and 2019:

  
Six Months Ended
June 30,
  
   
2020
    
2019
  
   
(In thousands)
  
             
Balance, beginning of period
  
$
215
    
$
273
  
Warranties issued
    
55
      
81
  
Warranty settlements
    
(78
)
    
(130
)
Balance, end of period
  
$
192
    
$
224